1990 454 exhaust manifold replacement

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I have a 90 454ss also. Edelbrock shorty headers fit very nice if mostly stock. I did long tubes. I do have a pair of stock manifolds if you need them
 

AK 99

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The factory studs in the manifolds are fairly soft. The trick is to center punch the studs in the dead center. Then drill with a 5/16" bit and you can literally peel out the old stud's threads.

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Then install the new studs. Mine don't match, I just used what I already had on hand. But those longer studs did make it easier to install the y-pipe.

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