Trick Flow small block heads

12many said
It’s a typical aluminum head on an iron block just like any other combo out there. Nothing unique about the TF heads
or the surface finish. Likely has to do with the fact you have to have a certain finish on the block to run Cometics and it’s possible some people have deck surfaces that are too rough to run those which would require block resurfacing. The new gasket recommendation would not. Just my hunch.

THIS^^^^^^^^^^^. If the surface finish of the head AND block are not correct you will have issues. You can’t hardly get the surface too smooth for a Cometic (you can, but you have to work at it), and you can easily get the surface too smooth for the FelPro gasket.

I’ve seen the results from the surface being too smooth for the FelPro gasket. I should have taken pictures of what it looked like.