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Post Info TOPIC: Will an LT4 "Red" Intake manifold bolt on to a stock LT1 head?


$y$Op

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Will an LT4 "Red" Intake manifold bolt on to a stock LT1 head?


The answer is NO. The LT4 manifold is diffrent and will not bolt on a stock LT1 engine. I have attached photos for the MEMBERS only so you can see for yourself first hand.

Enjoy the photos.

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$y$Op

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RE: Will an LT4 "Red" Intake manifold bolt on to a stock LT1 head?


Also Important to remember is the LT4 heads have ports .01 higher than of the LT1 heads.

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$y$Op

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RE: Will an LT4 "Red" Intake manifold bolt on to a stock LT1 head?


It used to be said by many that the intake of an LT4 was just the LT1 intake painted red. This is NOT true.

Best way to know for sure is to go with the part numbers-

LT4 Grand Sport - 12550630
LT4 Conversion   - 12550631
LT1 Stock           - 10108630



-- Edited by Administrator at 07:50, 2008-01-22

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$y$Op

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One other thing you will notice about the LT4 intakes is the small notch in the intake bolt hole as shown in this photo. Only the LT4 intakes seem to have this notch.

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Anonymous

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What photo? I dont see any notch?

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$y$Op

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The notch is on the drivers side, the third intake bolt from the front.

Here is a photo.

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User

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Lots of LT1 intakes have that notch as well, in fact most F/Y body cars have the notch.

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OUT-OF-HAND

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????

I have the damn photos posted!? Cant you see the diffrence?

The only other engine that has the same kind of lip as the LT4 is the baby LT1 also known as the 4.3 liter V8. Perhaps you been working on 4.3 liter V8's?

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User

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Wow. You showed ONE LT1 intake.

If I feel ambitious later, I will head out to the shop and get some pictures of my LT1 collection - I have SEVERAL intakes from LT1 cars, and they have notches on that third intake bolt.

I've had L99's, LT1's, and LT4's apart before, what's your point?

I also have a 302 CI roller-ized LT (GEN II) based engine. 9500 RPM...WOOOOO!

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We do PRECISION GUESSWORK based on vague assumptions and unreliable data of dubious accuracy provided by persons of questionable intellectual capacity. Now what can we fix for you today?


OUT-OF-HAND

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I am not speaking of the notched intake bolt hole. I speak of the extended ears from each pair of intake runners. Like shown in the top photo where the intake will not sit flush with the heads. Its like that on both sides. I think I need to edit some more photos with a more clear view of what I am trying to say then.

-- Edited by SELLC at 19:19, 2009-02-16

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