all valves are different.

It makes NO sense to me IMHO to use different valves in the same head. You can make a head flow great with all the same valves.

I know for a fact the the Ferrea valves have a higher dome on them than stock. So now lets say you want to run big cams, you have to measure piston to valve clearance and valve to valve clearance. Well how are you supposed to set the cams up with 2 different valves and 2 different clearances?

you can port the head, and lap the valves to match each cylinder.

HRD does it, Skunk2 does it, RLZ does it, i guess i just trust them more.

Im not one to argue Endyn cause Larry as done some DECENT stuff, but i just dont see a stock valve out flowing another valve, an mixing an matching in a cylinder head.

why not use all the same ones?