im trying to gasket match/port my heads and intake and i can find the gaskets with the bigger port sizes anywhere or maybe im not looking in the right place??if anyone could find me a part number or site or something anything would be great i have a 1994 z28

 

Yoy might try GM and get a set of LT4 Intake gaskets.

 

you quite possibly might have to cut them yourself. time consuming but, very satisfying when you get finished. Sick

 

Have you tried summit? I know I used the Felpro 1206 and it had a pretty big port size.