flattop1
Dawg 89
The lifter height issue?astro....then it becomes a matter of the cam and the lift that you want to run. the higher the lifter, the deeper the valve will open into the combustion chamber right? so then you are faced with the same problem....piston/valve interference. this is the area that I'm not really and not ready to accept and risk ramming the head of the valve into a brand new wiseco piston. this is why I said that not enough research has gone into the development of the hemi head for racing applications. it's not a question of why don't you, it's a question of what will it cost if you don't do it exact and right the first time.
I am assuming you mean a taller lifter. this is incorrect because you have to set up with the same clearance so no gain in lift.
now if you are talking about milling the head, again not quite as you are bringing the vavles closer to the piston not increasing the lift.
this in turn could cause a collision.
Simplest method to check valve to piston clearance is with modeling clay . place small amount on piston where you expect the valve to hit install head and valve gear/ assy, roll engine over remove head measure clay.