[gtofreek]

Originally Posted by Holeshot71

This is why I asked. I tried to use the "tin" fel pro gaskets with the round compressible surface between aftermarket RA manifolds and 6X heads. I found that the round surface didn't compress in some areas due to surface mismatch. The manifolds did say to use the fel pro performance header gaskets which I did use and had no issues.

The brand new manifolds out of the box were warped BAD! When I set them on the granite slab, there was probably a .040" bow in them. This has been the case with most of these manifolds I have installed new. So we took them and surfaced the gasket surface until they were flat. The steel gasket should work fine with them. Out of the box I could see you having to use the Fel-pro blue header gaskets or some Remflex. After surfacing them, they were flat so there should have been no need for special thick gaskets.