Situation for you. 1994 TBI motor. New set of Vortec Heads... Now I know that a new intake manifold is necessary to make this work, but which one it is I haven't a clue. Archive searching yielded much information on converting carb to TBI, but nothing about running a TBI setup with newer Vortec heads.... So, oh masters of engine building, what intake manifold is necessary to retain the factory TBI setup with the addition of Vortec heads????????? :confused: :confused: :confused:

stock vortec manifold or a aftermarket unit

I thought the stock Vortec manifold only supported MPFI and not TBI?:confused:

stock maifold is only MPFI. Scoggins Dickey Chevroket and/or Summit racing can supply you with an old-skool tbi manifold.
I think edelbrock makes them, but don't hold me to that.

GM performance (https://www.spoperformanceparts.com) part number 12496821 - Vortec Manifold With TBI

:):) :) AWESOME THANKS!

Also, I believe Powerhouse is making one now....cheap.

You could also run a Vortec manifold for a carb and then get the Holley carb to TBI adapters from PAW (cheap).

Whoa, Powerhouse is cheap. Anyone ordered from them? I mean how's the quailty. 350 rebuild kit for $157 including a cam and pistons???

Just get one from Edelbrock. Thats what I got on mine and Im running TBI.

Originally posted by SethHaines
Situation for you. 1994 TBI motor. New set of Vortec Heads... Now I know that a new intake manifold is necessary to make this work, but which one it is I haven't a clue. Archive searching yielded much information on converting carb to TBI, but nothing about running a TBI setup with newer Vortec heads.... So, oh masters of engine building, what intake manifold is necessary to retain the factory TBI setup with the addition of Vortec heads????????? :confused: :confused: :confused:

I run vortec heads with an early model 4 barrel intake, I had the heads drilled and tapped to fit the older model intake, cost me like 30 a head to have this done... I am sure the same can be done for the TBI intake :D

HTH

Originally posted by TPIJeep


I run vortec heads with an early model 4 barrel intake, I had the heads drilled and tapped to fit the older model intake, cost me like 30 a head to have this done... I am sure the same can be done for the TBI intake :D

HTH

I don't recommend doing this. The port sizes are different between the intake and the heads. Sure they will bolt on, but they are prone to air and water leaks this way. You can REALLY tell when you pull the intake and look at the gaskets. I went down this road already.

Originally posted by erich_in_AZ


I don't recommend doing this. The port sizes are different between the intake and the heads. Sure they will bolt on, but they are prone to air and water leaks this way. You can REALLY tell when you pull the intake and look at the gaskets. I went down this road already.


Hmmm.... 35 races on one motor without a problem and 25,000 miles on the other and not even a leak... :rolleyes: Ya your right, it does not work... :D

Originally posted by TPIJeep



Hmmm.... 35 races on one motor without a problem and 25,000 miles on the other and not even a leak... :rolleyes: Ya your right, it does not work... :D

Have you ever looked at your crush patterns on the intake gasket? THe ports on the vortec head are quite a bit taller than the intake runners. How do you suppose they get better flow on the vortecs? Using the same intake runner design? True they run a 170cc intake runner (Flows 239cfm @ .500" lift) but they are a different design.

Here are Felpro gasket sizes:

Stock with blocked exhaust crossover
Thick: .060''
Port Size: 1.23 x 1.99''

Vortec
Thick: .120''
Port Size: 1.08 x 2.16''

I would think someone who is obviously a racer, would have noticed details like this. Did you hog out the intake runners on the vortec heads (hell, that's only 2/3 of an inch of intake port per head) to match the width, and do the same same to the intake manifold runner roof? Should be pretty cool with the top of the runners transparently thin like that. Perhaps someone puts this stuff togther for you?

FYI, I ran a 383 with drilled vortec heads in a 67 GMC for a couple of years. it didn't start leaking for a long time, but once it did, it was almost impossible to stop. By that time vortec intakes had become reasonably priced sot I got a Performer RPM AirGap Vortec for it, and noticed an immediate improvement.

Hmmmmm, sounds to me like you know all about this stuff. :rolleyes:

Hey, did you also know that a 305 head will bolt up to a 400 block? Doesn't mean it works worth a damn. Maybe you reserve your smart assed comments for things you know about? mkay!

:shaking: