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Old 05-30-2003, 06:16 AM
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Post pontiac 455 manifold interchange

I have a 455 pontiac with 6x heads. I was told that the old style intake will not fit because of an enlarged air bypass port? on the side. Does anyone know how to go about putting an old non-EGR style intake on an engine with 6x heads?

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Old 05-30-2003, 07:56 PM
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Im not really sure what youre being told about old style vs new style intakes. But the difference is in how the mounting bolt holes are arranged not the EGR passage, they wont interchange. Your heads are the new style so thats what you should look for, not all manifolds will clear an HEI ignition so thats something to keep in mind too.

Old style = 1964 and older

New style = 1965 and newer


Also did you know that there are two different styles of 6X heads? Small chamber(came on 350) and large chamber(came on 400). I thought I read somewhere that there is a casting mark that you can tell which one you have but I always just looked at chambers.

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Old 05-31-2003, 08:37 AM
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A 1972 intake fits the new heads and has no EGR. I have heard of people pouring melted aluminum into the hole in the head. I think its just a blind hole. Having never had to do this, I think I would squirt some gas or oil in there just to make sure first.

[ May 31, 2003: Message edited by: jimfulco ]</p>
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