They're drilled for the TBI manifold and serpentine accessory belt as show in my other pictures. Jun 2, 2007 · 2006 1500HD Cognito 4/6” lift Intake and HPtune(JIM),Cognito Steering kit, comp 218/224 114lsa cam 306RWHP 307RWTQ 1994 chevy P/U 1500 Sportside 330 H. Jun 25, 2010 · 1. It's got 60,000 on it that way with no problems. Also the Vortec heads do not have an exhaust heat source to warm the intake and supply the EGR. i used to dog the 5. Aug 25, 2005 · i have a set of 96+ vortec heads and matching intake but would like to use the tbi intake that is currently on my truck for simplicity , the vortec intake would require lots of wiring and present other problems so my question is how can a fit the stock tbi intake manifold to the vortec heads? can i drill the heads to accept the intake manifolds bolt pattern? any information will help. using original pattern. Only if you use Heads from a `86 or older engine. Sep 8, 2008 · The bolt holes it the center of the TBI manifold are made so the bolt threads straight down into the heads rather than going at an angle. Do a search on vortec head converted to conventional SBC bolt pattern and you'll find a bunch of info on it. So far, $521. On TBI, this if very easy, TPI takes a bit more. Jul 31, 2014 · If the intake attaches to the heads using 12, 38-inch bolts (six per side), and the two center bolts on each side of the intake are at a different slant than the other intake bolts (as would be Aug 10, 2009 · Wedge Kit to install an early style Small Block Chevy Manifold ('86 and earlier)on Late Model Heads ('87 to '95 cast iron heads); Includes bolts and instructions GM modified the heads so that the center 4 manifold bolts are more upright instead of as the same angle as the other 8. 7L Genuine OEM 1988-1995 C10 C20 C30 Pickup Van Suburban Tahoe Yukon Blazer Jimmy OEM 0166135, 14102183 See options Intake manifold adapter Replace for TBI 5. No changing heads is not an option here. II Vortec CPI heads make substantially more power than the Gen. peace Hog Apr 7, 2017 · The 991 are small 1. Vortec heads will swap to an old block. That's great info. So, on the TBI manifold those 4 center bolt holes are at the wrong angle to be able to bolt it down the heads. 0L 5. Dec 14, 2013 · They do not flow well. Some are better than others. Computer chip is supplied free of charge with proof of purchase of manifold, cam and heads. the swap is one way. The port design is different that the standard SBC heads, but they fit one a Gen I small block as long as there is a Vortec intake manifold (the intake ports are taller). So an intake being a constant width and heads moving down closer to the bottom the spread gets narrower, the intake is a fixed size, the gasket space (only variable) decreases. If standard (older) intake manifolds bolt right up, they're just center bolt, not the hi-po Vortecs. This would also eliminate the intake problem. Oct 8, 2012 · Depending which heads you have (they should be just barely pre-Vortec) you are dealing with an Lo5 small block. i bought a conversion intake for this car (37 chevy) the intake is the same as a pre 85 small block. All i did was to unshroud the intake valve pocket to the 350 gasket line with great results. they are probably the "193" swirl port castings or simular. Dec 4, 2014 · The Magnum heads do not have exhaust crossovers in the heads, which means you cannot use the 1990's EGR setup in any way. Oct 4, 2016 · I'm using a Vortec block to replace an older TBI engine. 3 vortec motor. As you can clearly see, there are no inner bolt holes in the vortec head. Oct 17, 2022 · So apparently there is an option to put the 96 engine into the 95 truck and convert the intake to TBI which unless he runs into the GM G30 van from 1996 with a 350/5. Oct 5, 2009 · TBI setups only run one O2 sensor on the drivers side bank, and it's in the manifold. No leaks of any kind at all. GMPP Largeport Bowtie Vortec heads 207 cc intake ports(d shaped exhaust ports) 4. Jan 8, 2008 · Is anyone aware of the flow / performance difference between the new style ( 88-95 tbi centerbolt, but not vortec ) 76cc small chev 350 heads vs the old style 76cc heads ie: 441, 920, 336. Jan 8, 2008 · GM performance parts has a dedicated TBI to Vortec intake to fit the Vortec style heads. A TBI adapter will fit a spreadbore intake much better than a squarebore intake. 1340 Views 1 Reply 2 Participants Last post by Big Dave, Mar 1, 2013 Jump to Latest D. They flow better than Vortec and the old "camel hump" heads. The older style intakes are a lot more prevalent. Oct 1, 2010 · 4. However, should you feel its absolutely necessary then find yourself a set of 416 casting or 081 casting 305 heads. To my knowledge and memory the only stock aluminum heads with the same bolt arangment are corvette l98 tpi heads. Those are the last 3 digits of the casting number on top of that head under the valve cover. I popped a hole in the block in the correct location to match the water pump hole. You would do much better buying a pair of Dart SS heads or Vortec heads. Read more Sea Foam Motor Treatment Autozone: Enhance Your Engine's Performance Today Dec 26, 2005 · the lip old style, retaining valve covers. Apr 5, 2011 · the top head in that photo, is an older style head, with both an old style, and a Vortec pattern drilled and tapped. Aug 10, 2023 · That bracket fits on the front of the passenger side head, and that holds the Alternator, the tensioner and the idler pulley on that engine. Do not use cork or rubber end seals. Apr 5, 2013 · i have used this intake before, on a 91 chevy 350 out of a caprice. It uses swirl port heads which have mostly the usual Chevy bolt pattern except the center bolts, 2 on each side adjacent to the plenum, change the angle these bolts make to the head's intake port surface from 90 to 72 degrees. Need two brass fittings, some hose, oil change stuff, coolant, head gaskets, and intake gaskets. Just remember that the water pumps are different. any more?'s ask. . 4. The only information I found was to elongate the holes, extra sealant and large washers. werent two intake bolts done away with or something? around 1995? or did these crate engines keep the older intake pattern after 1995? Feb 28, 2013 · '92 350 tbi intake gasket swap. this is very common in the hotrodding world. The reason it won't fit is the bolt patterns are different. Dec 5, 2009 · Anyone ever used TBI on a Edelbrock RPM AirGap with vortec heads? found a intake for real cheap and would like to know. 87/1. Maybe someone else can chime in here, but don't TPI heads have the same funky center bolt angles? Sep 26, 2016 · TBI-style truck heads often have extra-deep spring pockets to accommodate intake and exhaust valve rotators that can trip you up when installing hot rod springs not intended for use with rotators. Usually accomplished with a die grinder or dremel. I think the heads should bolt right on, but the intake will be different because of the different fuel injection but I would like to keep the 96 fuel injection as well. Sep 11, 2010 · or common 87up tbi stock intake? would the heads on this engine be the old intake pattern style? or ? ive totally lost track on when the heads and intake bolt patterns changed, and for which engines. Ported, polished, painted black. The heads from the LO5 (old tbi) are a pretty decent match for the Vortecs up until a certain point, then they're shit. 7 350 adapts a small block 1. 2002 K2500HD, 8. Far more prone to cracking and the smog heads have 76cc slow burning chambers. The TBI heads have 65cc chambers and run well with much less timing. Standard L31 GM truck heads 170cc intake port 2. Apr 18, 2014 · Used a Weiand open plenum intake on the nephews 350. Angle or Straight plug design. Along with the heads a GOOD cam selection is almost req, then maybe an update to 350 injectors, a modified chip if they're still avail. Dec 3, 2018 · I put a set of the 87 TBI heads, 193 casting with the 1. Used a water pump gasket as a template for hole location. These holes can be redrilled on the intake to match your early style 327 heads. These things are ported and polished to the hill have duty valve springs 202 valves. Mar 4, 2002 · The 400 heads had extra, small holes (on the head gasket side) that were called steam holes. 5s in the 1/4. Apply Edelbrock Gasgacinch sealant P/N 9300 to both cylinder head flanges and to the cylinder head side of the gaskets, allow to air dry, and attach the intake gaskets to the cylinder head. I would not be suprised at all to see a noticeable loss of torque until somewhere above 5,000 rpm. Nov 26, 2004 · Im pretty sure the corvette L98 TPI had the aluminum heads which have the old standard intake bolt angles. The vortec and non-vortec engines can use the same head. - All heads starting in mid-86 became centerbolt valve covers. com 390HP/456TQ with New World S/R torquer heads-Edelbrock Performer TBI Intake-50mm Throttle Body from Xtremefi for 750cfm-454 Injectors (90lb/hr)-18 PSI TBI Fuel Pressure Regulator Spring-MSD Blaster Coil-Mallory Wires-FPG001 In-tank Fuel Pump-5" Tall Air Filter with New Crinkle Finish Lid and Base Jun 19, 2013 · In all honesty, you would have the same outcome if you got a good Vortec 350, and either use the Vortec/TBI intake, or run a Performer RPM Vortec intake with your TBI on top. The LT1 and 4 heads are set up for reverse coolant flow(i. Mar 28, 2004 · Seems some people are calling any center bolt head a Vortec (I've seen it on eBay). 7L Power Package (manifold, cam, heads) is used. This is for an old style intake and I am unclear if I can use the 87 and newer style heads for one, and to be blunt what they all flow like and their valve size and combustion Dec 29, 2005 · A 94 and older TBI small block will take the old intakes by modifying the center two holes on intake on each side. Mar 3, 2006 · You need to run a remote T-stat to get water from the heads to the t-stat no matter which style intake you run. This allows you to actually get a wrench on them and tighten them properly. Apr 3, 2008 · S/R Torquer Cast Iron Heads with Accel 276 Plugs (with . 530 Lift, Bronze Valve Guides HD Tri_Metal 780 “IROC” Series Rod, Main & Cam Bearings. A 90 TBI engine should have the provisions for a roller cam so I would recommend something like a 08-304-08 Comp roller cam. 2. you can keep the throttle body injection if you change over the computer. Here are some intake flow numbers @ 28"H2O just for the sake of comparison. and install them with sealer in the old style pattern holes. 5:1 compression, stick with the cast-iron manifolds, the stock sized TBI(ultimate TBI mods of course), edelbrock 3704 intake, add 1. mortec. No chip changes or computer mods required unless entire 5. 0" or 2. 200 and this was a PITA. Apr 8, 2022 · This Vortec heads Vs TBI heads comparison of features will help you learn more. Eddy make an intake for Votec heads and non computer carb. Oct 16, 2006 · The TBI engines have the same 6 bolts per side pattern of earlier heads except the center 4 bolts are at a slightly different angle and a factory TPI intake will bolt up to a TBI cyl head. good luck Aug 5, 2009 · I got a obs lbrc it has a 350 tbi i got a rcx 6 inch lift and running 36x13. Right now I have just the stock vortec timing table in the stock tbi parameters. The 1987 thru 1995, 350 with TBI is the LO5 engine. Don’t no if that helps any . This features a relatively low profile and long-runner design that accepts two 90-mm throttle bodies, making it a great choice for those who intend to run twin turbochargers. Sounds like he cheaped out on it though. I've had the heads, intake and cam sittin in my basement for a year now. Jul 26, 2011 · Engine and Drivetrain Tech. just about the worst smogger head combination, suitable only for bone stockers or use as boat anchors or door stops. GMPerformance part Smallport Bowtie Vortec heads 175cc intake ports 3. Sep 27, 2007 · Vortec heads are basically LT1 heads without the reverse coolant flow. To make this deal work, you'd need to use pre-Magnum (LA) heads. Took 4 thick washers, stuck them all in a vice, and bent the edges over at 90 degrees. When it comes to Vortec heads, you need to use a Vortec style of 8-bolt intake. That would be the easiest swap. but that is what i did. 02/1. I don't know if the TBI heads had them. Nov 15, 2018 · Yes but the OP already had the OEM style Vortec heads on a running engine - he wasn't building a new one or updating. Jun 10, 2024 · Handling a carbureted intake manifold on TBI heads requires attention to detail because the alignment of the manifold bolts is critical to ensure a proper seal and performance of the engine. We can both use the same intake and carb. Jul 22, 2010 · I engine. Dec 5, 2010 · hey guys i am building a 454 tbi for my current project and need some help choosing heads for it. 428/. And i already swapped the heads and intake over to a traditional style with a carb and an HEI distributor. There was a plug in the bottom of the intake and it hit the balance shaft. You either need an intake to fit the crate motor, because of the heads, alot I seen use the old 2 bolts on either side, and the 4 bolt holes are different angles on tbi intake and heads compred to carb intakes and old style valve cover type heads like pre 87. what can engine mods can i do to Jan 23, 2016 · I have a GMPP swap intake on a vortec with the tbi set up off a 1989 chevy truck in my 1989 Nissan D21. These heads do not the half-intake port blocked as do the 350 heads. The bolt pattern for the front of the head is identical to your Vortec 5700 V8. Apr 1, 2023 · The standard TBI intake manifold will not fit on Vortec heads. They must remain unported Mar 2, 2007 · Paul I think he may be refering to the non. Dec 10, 2007 · adapter for the tbi is pn# hly-17-45 u can get a summit racing. Just a thought. Has an Edelbrock Air Gap intake with a Holley 4010 650 and early type HEI. Nov 23, 2021 · Among the factory and aftermarket multi-port injector manifolds available, Edelbrock now offers a very cool Cross-Ram intake specifically for LS3-style heads. 262ci Forum (4. Installing a Summit Racing dual plane intake manifold on a small block chevy with vortec heads. Either that, or plum the newly tapped water passages from the ends of the heads into the wet intake's coolant passage under the t-stat. 5. 50 valves) small chamber on my 350. 3 on a CPI Vortec motor. 428 Mar 23, 2018 · Personal experience the TBi heads get a bad rep but those smog heads are even worse. Oct 13, 2019 · I did that back in the early 90's when we got those engines in the yard every week. The Vortec heads used a different bolt angle and I think it was 4 bolts per side as opposed to 6 per side like the standard older stuff. Yes you can easily make your intake fit by elongating center holes with drill this is best done by turning intake upside down and leaning drill in direction required to change angle of hole to align with cyl head holes. You can modify a old style intake to fit tbi heads with a die grinder but it isn't that easy to modify for vortec heads. Apr 28, 2009 · I was just wondering if anyone knew what it would take to put a set of 96 vortec heads, intake, and throttle body on a 92 4. Oct 5, 2015 · Its not the 70s anymore, get an LS (5. Tomorrow I'll be picking up the small stuff. Dec 30, 2015 · Couple of ways to fix it simply make a flat plate with the 350 TBI gasket on bottom and the 454 one for the top. Post up a pic of the intake you have. The Vortech heads have much tallker port runners so OEM old school intake ports are much to short. O. Apr 1, 2011 · You can. Like was said, true duals will sound like ass and cause torque loss. Make about 400 FT Lbs torque with a 262 Comp extreme energy cam. Vortec style intake manifold bolt pattern. Now a vortec head as stated above only has 4 bolts per side, 2 on each end that run vertically into the head and NO bolts in the center locations. You need to get an intake for a Vortec head or I think you can drill your existing intake to match the necessary holes. We are in a stock restricted circle track, class, and theses heads are ' legal ' , sort of. Aug 29, 2002 · I run a set of 87 305 ss-Monte heads (1. Many of the electrical signals are very small so damaged wires and connectors have a great effect on performance. O and the rest of the sensors that seem to scare you are self contained on the throttle body ie tps n iac Apr 3, 2007 · Sounds like you are trying to install an old style intake on a set of later model heads. Dec 31, 2006 · So, the TBI intake will only work on TBI-style heads with the funky centerbolt angle. 16. THIS CYLINDER HEAD HAS THE FOLLOWING: 190CC intake ports. I have to believe the big block head/intake bolts are different. Mar 23, 2014 · The angle of the 2 center bolts on 87-95 heads are at a different angle the 86 and older. They range from right at 200 cc's up to maybe 230 cc or so intake port size. Bronze thick wall guides. IMO though, there are better aftermarket heads available for TBI replacements. Either slot the intake holes and grind a flat spot for the bolt head or get an old school intake and make a tbi adapter. edelbrock makes brackets that work with the throttle cable, tv, and cruise. So the same intake can be used on any generation head. Nov 7, 2010 · All SBC gen I and Gen II heads will bolt onto the block. water jacket similar to stock. Apr 17, 2007 · ok, I know this has been posted before but I cant find it. The Chevrolet Performance Vortec TBI Intake Manifold is designed to deliver maximum horsepower and efficiency with throttle body fuel injection and EGR usage on small-block Chevy engines. A Vortec head with standard intake port inlets/bolt pattern neuters one advantage of a Vortec head - the higher intake port. I'm currently doing this on my 95 s10. Ported Throttle Body to 50mm May 20, 2020 · Um, with a fixed width of intake at line X, when you go farther down into the right angle on a given plane, the distance decreases. Feb 11, 2006 · 93 Up motor intake Ryan, I am guessing that you are talking about a 350 chevy motor. Oct 31, 2013 · Yeah the last 3 on the head casting is 810. There is lots of meat in the walls to port. The TBI intake from 87' to 95' will fit either stock or 'vortec' head. 1. 0, ls1 even a 4. Nov 14, 2015 · Does anyone know if there is a way to modify the typical small block chevy aluminum intake manifold to fit 87 and up 350 iron heads? I am asking because I am unsure of all the differences. Raised intake roof for enhanced air flow. Dec 19, 2005 · Now you take the above engine, add a 1/4" of stroke, . Carb is carter bb 2bbl 1968 model. The center bolt non-vortec heads(87-96) use a slightly different intake manifold. Smaller combustion chambers for higher compression too. Aug 8, 2004 · The first thing you will need to do is remove the old fuel injection system from the intake manifold up. Mine will burn less fuel and make more power. I have a 1990 BC roller motor I built for my '39 Chev coupe, and I bought it as a short block. slows. Nov 19, 2018 · Small block vortec heads are drilled different tbi style heads for the intake manifold. -Trans-Dapt 2210 four-barrel to TBI adapter, center mount. Feb 10, 2009 · I have searched and read many articles related to using the older 55-86 SBC intake manifolds on 87-95 style SBC with cast iron heads and canted inner center bolts. Sep 12, 2010 · Vortec heads actually came out in 1996 the issue with 1988-1995 is the throttle body injection intakes and heads are different then have vertical bolts from the intake to the head were as old style was at an angle. I'll have my heads milled around . The Gen. 5x15. I. Aug 26, 2014 · next time you have access to the later vortec style intake gaskets (even old used ones) and a 1955-85 first generation cylinder head ,or first gen intake gaskets and a vortec cylinder head, take the time to line up the bolt holes on the gasket and cylinder heads, I thing you may be rather amazed at the differences in port size and locations. Dec 24, 2006 · The Dart SS and 180 heads are not spectacular from a flow-per-port-size standpoint. I'm looking to do a similar build with my 89 only instead of the heads I'm going to flat head pistons. Dec 25, 2010 · - old heads, 12 intake bolt holes, all are same-angled. down appox. Jul 28, 2014 · I have had great results with Trickflow 87-95 aluminum 23 degree heads with both 350 and 383 applications. The wiring and connectors needs to be in very good condition. 3. these are the old style heads. Custom mapping of your ECM will be required. Jan 23, 2011 · Before the fuming starts I researched and researched on this. 035 gap) Stainless Steel Swirl Polished 2. 1L, Allison, 285's, Daily 1994 C1500 RCSB, 4/6, 375HP 350, TH350, Toy Bolted a pair of 305, swirl port heads onto my nephews mild 350 in the 51 Bus Coupe. They function like the "wedges" sold with multi-fit intakes these days. I TBI heads. You can use a 4-barrel vortec intake and build your own TBI adapter or Holley #17-41 (about $40) will work also to a spreadbore flange. vortec style head that is still 6 bolts but the 2 center bolts (about where the heat riser is or used to be) are not 90 degrees to the intake surface. Because the block has siamese cylinders (no water passage between them) the head had extra holes to help with water circulation. I think the only difference is the four center intake bolts are drilled at 72 degrees instead of the typical 90 degrees. The stock exhaust manifolds are fine, but a 2. Apr 6, 2014 · Vortec heads, both intake patterns drilled. May 15, 2017 · Semi related but I've got an '89 Fireturd with a LO3 305 with Trickflow aluminum cylinder heads, that Performer TBI intake and a JET stage 1 chip. Oct 22, 2013 · 2nd tbi itself, the intake mostly. Dec 21, 2011 · The intake is the biggest problem, the heads have a different bolt pattern between 87 and 97 so the TBI intake doesn't simply bolt to the 97 heads. Monzter. I took the plug out (pipe plug) and ground the boss down and tapped it so the plug fit in deeper and would clear the shaft. Sep 13, 2007 · i have a 4. 12496821 The iron LT1 heads and the iron Vortec L31 heads share port design and have a small advantage over the LT1 alum heads. but you also need a 96-99 truck dr side ehxaust manafold and an external EGR tube in order to port ehxaust flow to the EGR valve mounted on the intake like the stock TBI intake is (Vortec heads have no internal exhaust cross over for EGR). Jan 6, 2011 · If you use the tbi heads use tbi intake and it equals tbi motor. 95/1,50 valves and 65CC combusting chambers, on a 75 350 that's bored 60 over with a 252 Comp Cam. 6:1 rockers, and you have the engine we put in my dads 1989 TBI suburban. Chevy Vortec Aluminum 350 Cylinder Heads 64cc 2. The Vortec heads performance minded people are thinking of have 4 intake manifold bolts per head, other center bolt heads have the 6 bolts per side. Peanut port that have wider than tall intake ports. Vortec intake manifold bolt are vertical, compared to the original design of angled. You will have to find a TBI intake that is built to fit on the Vortec head. Some of the TBI manifolds can be redrilled for the old style heads, but I don't think a TPI manifold can. 3. None if the intakes i have will fit on these cylinder heads, i have 2 weiand accelerators, 3 performer rpm's, and 6 stock style SBC manifolds, some early model, and some late model, all have the same results. Jul 25, 2006 · I used a stock TBI intake from a 88 4. The 87-95 TBI heads have the 4 center threaded holes angled more upward. I would assume that the "kit" is only an upgrade from iron heads and intake to Aluminum heads and intake. This manifold is primarily intended for use with Vortec heads on pre-1996 engine blocks. The Vortec head is basically known for having really good flow at lower lift. I also had a custom chip made that didn't look for a EGR Oct 1, 2022 · One other idea, depending on how much you wanna spend, get these heads and mount them on your old 350 short block. Again going off memory the tbis are straight up and down and the old style are angled likr the rest of the bolts. Of those, you can swap TBI stuff with the older style but you have to wallow out the holes to Apr 6, 2004 · The TBI intake center bolts (left & right sides) bolt straight down into the heads, not at an angle like the rest of the bolts. I want to retain the reliability of TBI. If someone is to use an old head or they would have to use an old intake. It's a direct bolt on. Featuring the famous double hump marking on the ends of the heads, the #3782461 and #3782461X heads used 1. 3) Chevrolet Performance Parts - 12496821 - TBI Intake for Vortec Heads. They're about $430. Nov 15, 2016 · Stock 1989 350 chevy intake. Nov 30, 2023 · Another option, depending on your skill level and courage, is to buy heads with the older 6-bolt intake pattern. i bought the truck in 97, already with a racing tranny tranny, custom rear-end, racing clutch. L-29 Vortec heads are around 230 cc's and are true, but small port large oval. 454 TBI Intake. 95 GMC 350 TBI 200/206 . Jul 13, 2011 · -#062 Vortec heads. To do that you must drill and tap the Vortec heads to match the TBI intake manifold bolt holes. Honestly, I don’t recommend modifying a 305 engine to this level. Jan 19, 2014 · The SP heads run out of intake capacity on a 350 around 4500 RPM. Instantly the HP rating increased 55HP to 255 HP primarily from the power of these cylinder heads. - TBI heads, 12 intake bolt holes, center four are at a different angle - Vortec heads, 8 intake bolt holes, straight down angle. Vortec heads flow so much better than old head designs, I would just goto a local u-pull-it junkyard and get a complete Vortec motor for $100, they are a dime a dozen. then a 2" bore 454tb with the certain flow of injectors (that i cant remember) and an ebl unit that makes tuning the motor very easy. Feb 28, 2019 · THESE CYLINDER HEADS HAVE THE FOLLOWING: NEW HI-FLOW Aluminum 64CC cylinder heads. = $53-New set of head bolts, both sides = $24 locally. Intake part number: SUM-226018Gaskets part number: FEL-1255 Jul 20, 2009 · i know the tbi bolt pattern is just slightly different in the middle than the old school 350's definately use the TPI heads over the TBI's in fact, just go ahead and throw the TBI's in the garbage so you have to get a different set and then, worst comes to worse buy a carbed intake manifold for it and buy the carb to TBI adapter plate to mount your TB back on there both intake Dec 22, 2002 · head, as well as the old "dbl hump" heads. Designed for swapping Vortec heads onto TBI engines and is EGR compatible. Mar 17, 2010 · The IAC needs to be carefully adjusted and if old probably replaced. Nov 7, 2007 · When they first came out with the Vortec heads we had to use the Canadian 2 barrel intake and we machined the holes in the Vortecs and we had to double up on the gaskets and have the intake higher we had to machine the dist. With these heads you get all the advantages of the new heart shape combustion chambers plus the improved flow over the old style heads. Edelbrock makes two different 4-barrel carburator manifolds, one that fits CPI heads and one that fits TBI heads. So the best bang for the buck is GM Vortec head but does require a special intake and lots of EGR work if you need EGR to remain emission legal. B. Apr 12, 2021 · If I were doing this again, I'd buy the Summit aluminum TBI heads, and use the TBI manifold instead of using the older aluminum heads (old-style intake bolt pattern) I had on the shelf, and the ZZ manifold. We make sure everything is going to fit how it should before it Apr 21, 2013 · Tell ya what - you build a 350 out of an old block with old OEM heads and I'll build one with TBI or Vortec heads - no porting on any of them, old or newer - and you use a flat tappet cam, I'll use a roller with the same advertised duration. 045". in '01 put the truck in storage and just got it running again. Nov 16, 2020 · Bigger cam, modest compression (probably about 9:1) and the single worst-flowing heads chevy ever produced, including old-school 265 heads from the 50s. Apr 3, 2018 · You can drill and tap the heads for the old style intake 12- bolt pattern, this was done a lot back when Vortec heads were new to the scene in 1996 and carbureted peformance Vortec bolt pattern intakes weren't even available yet. Jun 23, 2007 · There are a few different Vortec style raised runner heads on the market now. I know that the two middle bolts would need to be drilled and tapped and the intake manifold will need to be ported to match the vortec heads. Just use the correct intake gasket for the heads and drill the holes. The very few aftermarket offerings that will work otherwise for you DO NOT have EGR provisions. Jan 29, 2011 · I put an aftermarket intake that was slotted for both the new style heads and the old. 94/1. These numbers are to correct the misinformation out there about the Swirl port, the flow numbers for the HO head as you will see below cannot be interchanged with the swirl port, the swirl port is in fact a far superior head in this regard. No. 190CC intake ports. Jul 4, 2009 · Is a 1989 Chevrolet 454 TBI intake interchangeable with the old style oval port heads? in this thread in this sub-forum in the entire site. You have heads that completely stall flow at 4500 rpms, but a cam that probably doesn't even wake up until 3500. as the newer EFI manifolds bolt differently to the heads. Never done any porting or changing anything, bought gaskets for the old style and just installed them. 2. The TBI heads have the more vertical center intake bolt angles. Get you a bored our TBI and intake, or use a TBI adapter to a 4bbl intake. I haven’t found anything better than a good old AC Delco R44TS or R44LTS depending on which plug length you need for your heads. Jan 8, 2021 · Upgraded Vortec cylinder heads, a more aggressive camshaft, and reprogramming TBI chip to make 300 horsepower or more with a GM Chevy 305, 350, and 454 engine with factory TBI injection. 3, 6. 72" intake valves and large 76 cc open chambers. Apr 13, 2015 · The first small-block with a 4-inch bore came in the 1962 Corvette 327ci, and it really opened eyes. 150 Wet Nitrous Holly kit w/t external full cell Jul 7, 2022 · In this first part I removed the intake manifold to inspect the gaskets, but we will still continue too change the head gasket on this 350 TBI. Does any one have the correct information on how i can modify the intake manifold to get it to fit my head's properly. Make the plate big enough to cover the 454 TBI passage. Accepts all OEM equipment and small-bore (1-11/16'') throttle body injectors only. The mounting base for the intake runners is much wider than a carb base. If I am going to to put a tbi intake manifold on my 78 350. But a 305 being 23 percent smaller than a 350 it would be mathematically possible to extend the 305 RPM limit with regard to the 350 by that amount which would be 5535 RPMs which is not a bad upper limit on a 305. I want a little more motor. These heads are good for a minimum 50hp gain. I really want to ditch the pistons. I originally ran it with the stock tbi chip, but had to have a custom one burned for it,as the timing tables for each engine are different. Mar 5, 1999 · These newly designed for 1996, state of the art heads are made from cast iron and replaced the former swirl-port TBI heads that had been previously used on the GM truck 350. As has been mentioned, you need to use a traditional HEI, not the one from a TBI. Check the casting # on the heads. com for info on the heads. you should consider a cam swap and upgrading the springs as well. 11 Eaton posi. The TBI heads are the worst flowing heads GM ever released. custom paint job in '99. I have done this on a Edelbrock Vortec Performer intake to keep my TBI and it worked fine. Dec 8, 2023 · I did some drilling and grinding to allow my factory TBI intake to fit earlier SBC heads. It Intake Manifold TBI SBC 305 350 5. 8) and swap it to see huge gains all over, from reliability, power, gas mileage, and availability of parts. Crate 4. The motor came out of an 89 Suburban. i tossed the flow masters on it, put jba headers, high flow cats and mandrel bent 2 1/2 inch side pipes. If thats what it is and the heads are off I would modify the heads. In fact, to one way of thinking, it's not even a "Vortec" head - it's just a bigger port standard head. Edelbrock makes an aluminum intake to fit the newer swirl port heads that has a standard spread bore carb mounting on it. Use carb motors heads use carb intake n adapter equals frankenstien tbi motor. The truck is a 1990, so it is the older style, 2-piece main seal block. First, the center bolt water jacket ports are too thin; that is why they are cracked 9 x's out of ten due to any type of heat or over torqing of the heads & buying the edelbrocks (that vic's team fixed) which have a full boss to eliminate that problem; are very pricey. the water goes from the heads then through the block) so those aren't what you want to use. in the early 90's chevy went to a VORTEC setup. TBI style intake manifold bolt pattern. 030" of bore, 9. Nov 8, 2013 · Bottom line : Can I use the entire longblock from a '98 Vortec 350 in my '94 (with a Vortec TBI intake)? Will all TBI accessories bolt on to the '98 block? I'd like to just rebuild the '98 block & heads but if I need to prep my '94 TBI block for a roller conversion and swap the Vortec heads on it I will. 50 inch valves. Vortec intake is only eight bolts and the TBI intake is 12. Jan 1, 2006 · The change was made in 87, same time they went to center bolt valve covers. Vortec design combustion chamber. I have never had any issues. 25" smooth y-pipe is Apr 13, 2012 · It sounds like you have an intake for Vortec heads, not the early TBI (like the 87). So with the older style heads I have to drill out the 4 middle holes in the manifold so that it wil Jan 8, 2012 · alot of thirdgen. Mind you that's with an old style cam shaft, not the better roller like yours should be. Jan 24, 2011 · The heads will be a major concern as to which intake you use. For use with Vortec cylinder heads, these manifolds are cast aluminum and precision machined to adapt to your 1987-95 Chevy/GM. Oct 4, 2011 · Its a great swap Christian but do some research on which Vortec heads to get. Put aluminum bolts with Loctite thread-locker and "activator" so the thread-locker actually hardens, or epoxy, or Superglue, or whatever into the center two holes. They can be found in cast iron and aluminum, the aluminum being the most desirable because of their smaller 58cc combustion chamber. Most aluminum heads and the vortec heads require the longer LTS plug where the TBI heads and most old iron heads use the shorter TS plugs. Fully clean the cylinder head intake flanges and the engine block end seal surfaces. thanks Sep 15, 2014 · and I wished I'd of had the tools to pull those heads as they would of come home with me. Some 350 heads were used on both 350 and 400 and had the holes. e. 75" bore throttle body injection 1" thick Fits Pattern 4-barrel Manifold Alloy Durable Mar 1, 2021 · Many of the late aftermarket intakes now come with oval shaped holes for the intake bolts, and they come with inserts that fit the holes for either old style, or new style head angles. In this two part series we show you the importance of proper intake fitment and how we do it. Hardened intake and exhaust seats. May 29, 2007 · www. i havent ever machined top of intake for bolt heads to sit flush nor Aug 16, 2010 · They do not have the swirl port style of the stock TBI heads, but have the same combustion chamber size as your stock heads. For the classic perimeter bolt valve covers and regular old style intake the 416 and 601 are probably the way to go. good luck . 458 Hydraulic roller cam L98 iron heads, Thorley headers Mar 31, 2010 · I have heard that you need to modify the 4 center bolt holes in the intake manifold because the bolt holes in the '87 + heads are at steeper angle. I've seen guys modify (hog out) the center holes and put TBI intakes on older heads, but its not ideal. The Heads. I went and got a 2104 Edelbrock intake and I found a set of 93 Camaro heads,both are the centerbolt style but I didn't know if it was going to be worth swapping to the Camaro heads or just keep the original heads? Sep 18, 2013 · Flow bench tests/numbers for TBI/TPI intake port 187 casting, aka Swirl port. Regular large oval have taller than wide intake ports that can be anywhere from about 230 to 262 cc intake port size. Or build up the area on the TBI intake with JB weld and grind smooth. I finaly ordered a porting kit and the tools to cut down my valve guides last week. This is pretty old, but still has some relevancy. I got a set of heads off a chevelle that went 11. worked fine no problems. 193 is typical of most TBI '87'95 iron heads, with half the intake valve-bowl approach blocked off—not good for serious Jan 10, 2011 · The differance between tbi swirl ports and the earlier heads is the angle on the center intake manifold to head bolts. 3 tbi from 94 with the vortec heads. Found locally for $300. My problem is intakes. We got the heads for free with 14K miles on them, and although swirl port heads are supposed to be junk, and limited to about 4500 RPM, the motor will buzz to 6000 very easily. With the Vortec heads you will need a matching intake manifold. I have it on a sb400. Those heads are built beefy for heavy duty use and they'll take punishment all day, but their performance use is more aimed at the porting scene. Ported Edelbrock Performer TBI Intake to 50mm HP Double "True Roller" Timing Set. 60 valves Comp Series Springs . The Vortec intake is also about roughly 1/2" wider than any chevy intake as well. So do I have to get a special chip made to "eliminate" the EGR from the computer, or what? The application is in a C3500 dually used almost exclusively to tow my 11000 lb 5th wheel. Both engines are internally balanced, so flywheel can be reused. I've read they are about the worst pistons you can have. Dec 27, 2014 · The vortec heads have no heat ports to the intake runners to operate the EGR. The TBI water pump shouldn't be used on the Vortec block without drilling the coolant bypass in the heads and block. It's everything you need for a serpentine belt alternator and water pump all on one bracket. you can make great Apr 2, 2012 · If anyone out there truely knows Vortec than you would know not to give the fella some poor advice on using Vortec heads. with aluminum "lugs" that let you use the angled bolts. I want to put a edelbrok tbi intake on a 96+ 4. Apr 3, 2013 · The late '80s marked a return to smaller, 6465cc chambers. the old intakes can be modified to except the new heads, but not the other way round. Once you have it off, clean the surface of the heads and lifter valley edges of all gasket material, taking care that no debris falls into the lifter valley or down the ports. dbf 72 Discussion starter Aug 11, 2023 · You can run a Vortec longblock with a TBI adapter on a Vortec "carburetor" intake. Extra thick deck surface. I want to stick them on my motor. Jul 19, 2011 · iron 350 heads from 90-92 on the corvette iron 350 heads from 84-86 aluminum 350 heads from 87-89 Aluminum 350 heads from 90-92-----This gives me waaay to many choices. As said above 100X only thing you have to get is an aftermarket intake. Jan 29, 2005 · the quote above is only partly correct. Later tbi and vortec heads use a different bolt pattern for the intake. org guys are using the victor jr 2bl intake for vortec heads with a tbi adapter. the `87 & newer heads all have the two bolts that are pitched up 15 degrees. The lower pic is an 031 vortec head. I will use the older TBI water pump along with the entire accessory-drive system, the water pump has the 3/8 bypass hole on one side. and YES you can put a newer style EFI on the old heads, however it will after to be aftermarket. The Vortec heads have no provision to exhaust heat the intake but that capability is in the intake. 60. I am currently putting a 350 out of a 92 gmc into a 71 chevy truck. . What you can also clearly see, is that no amount of grinding is going to make the remaining holes line up. 7 which has a factory intake that adapts TBI to L31 Vortec heads, he will have to run an aftermarket 4bbl intake with a TBI adapter and make other mods if he’s running EGR and Apr 11, 2009 · I've got a 92 Chevy truck engine(350) that was/is TBI but I'm tired of trying to get all the pieces to to put it together as a TBI engine. It will make a flat part to seal the bigger passage. Like bald1 said, most days it runs slightly goofy when cold and the stock TBI unit doesn't seem to feed it enough at higher RPM's but when hot it runs perfect. the carb'd 350's were still really popular but the issue was the only intake came from a monte carlo and at the time was $480 from GM for the rochester 4bbl carb applications for 1-2 years only during the pre TB injection being introduced. The intake manifold bolts will need to be elongated, its too easy. A vortec engine that is Nov 21, 2010 · Set of Vortec heads, bigger rockers, Eledebrock RPM Air Gap intake, 650 carb, mild cam shaft, headers370hp all motor. But, it will run like shit. Jun 23, 2011 · To be able to run a TBI intake on pre-87 heads then you'd have to re-angle the 4 center bolts on the intake. Mar 27, 2007 · -Crate 383 TBI from Motocrate. My 87 has center bolt heads but the older style intake bolt pattern. What makes Vortec heads any different from other GM steel heads? Mar 26, 2020 · T. Mar 22, 2010 · That intake won't work with the vortec heads, as you noticed. xyw uog kod yztarn zro syro cgxlo lerfmhx pafinb urhe