Uses these on LS7 in C6Z - Aftermarket O-Port Manifolds (flange not ground/aligned properly) vs. D-Port outlets - these gaskets are excellent! I had a small leak at the bottom of the exhaust port - I removed all of the gaskets that were originally installed with the aftermarket manifolds. They are thick enough to solve some minor fit/misalignment issues and perfectly connect all screws. holes. I FINALLY fixed the header leak, now the LS7 sounds absolutely great! Also works with most other 0-port LS based motors - although this was the perfect solution to my D-port problems!
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