Don't forget that actual valve lift at the retainers with the race valve springs will never be as much as the advertised valve lift or exactly the same as when using light checking valve springs I've seen as much as .040 loss due to pushrod and valve train deflection Good thick, stiff, pushrods can make up for a lot of that loss
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)