1979 Camaro Berlinetta manifold question

I have a manifold from my old 1979 Trans-am its a pontiac performer with carburetor, and i was wondering if it would be able to fit the chevy engine.

its came off a pontiac 403
and im wanting to put it in a chevy 305 ..

The answer is no….
First of all the 403 (which I also have in my 79 T/A), is an Oldsmobile small block that even Olds doesn’t “recognize” as one of their own.

The Olds engine has a wider intake valley….(the heads are farther apart). Chevy blocks are much narrower.

Be careful on selecting an aftermarket manifold for the 305….the ports are much smaller than the 350….good luck!

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