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What would most consider to be too far off from flat? My new Texas Speed headers are about. 040" high on one and .060" on the other in the middle.
I found a post where Kooks said. 040" is normal, no problem.
I think I'll try and do some flattening before I go to the work of trying to install, regardless of gasket, and find out it leaks, then have to pull them out, then flatten... Borrowing a HD c-clamp from the shop for tonight/this week after work.
If I can't do it myself, I do work in a steel shop, somebody here can do it for me. Thanks guys, very much appreciated. Will look into the Percy gaskets if needed still.