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Wow generations of engineers have been wrong - what I suggested in the recommended procedure that's been taught since engines were invented. Heads only ever warp by a few thou and half an hour using glass and grinding paste will leave the surface perfectly flat. If half an hour is too long for...

Almost certainly a warped head, but some of the methods being suggested here to flatten it are a good way to ruin a perfectly good head. Do not use sand paper or concrete both are far to coarse and inaccurate. The best way is to use fine valve grinding paste on a piece of glass, preferably 1/4"...