Do you know what the valve springs pressures are open and on the seats?
I'm thinking the hydraulic roller lifters will need more pressure than the standard flat tappet lifters due to the increase weights. I will shoot for 140 to 180 lbs. on the seats and from 340 to 400 lbs. at max lift luck
I do have a 1400 lb. valve spring tester and a bunch of valve spring shims so i can usually get them within 10 Lbs., +or - 5Lb from each other on the seats and within 25 lbs of each other at max lift depending on the valve springs and actual lift at the valves wrench


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)