so info i found and went by and i trust their stuff alot can be found at NHRS Performance... cant remember the exact web adress but just typer in nrhs performance and it will pop up... most of the motors they build they dont even use base gaskets... just pro bond which works pretty well and will add a little compression cause your lowering the cylinder and the head while keeping the same stoke... but if you do that you will have to get into claying the heads and everything to make sure your squish angles and clearance's are correct of you risk catasptophic failure...