I have those in my 5.9 magnum I'm not sure i can tell a difference but I have a bigger cam in it too.
I think what ends up happening is it end up being like a variable lift lifter, that might work too but I'm not really familiar with them.
I just like the oil feed hole in the lifter like edm has but they cost quite a bit more.
back then there were none of these wories. He had shot peaned and sculpted rods that looked like mirrors. 2.02 heads, blue racer rollers and guides that whole 9. It made power to about 7600.
so I guess on here my next worry is stock type lrockers. are they gonna hit the retainers?