I used one Hydraulic roller lifter cam kit from Comp years ago in a street hemi motor for a local customer, I could not make it quiet no matter what way i set the preload rant It sounded like a old 30-30 Duntov solid lifter cam that came in the early Corvette motors whiney
The customer ended up saying don't worry about it after driving it.
I heard later that Comp Cams sent back 1500 sets of that brand hydraulic lifters for all motors, not just Mopar BB V8.
Evidently they bought a bunch of defective hydraulic roller lifters shruggy
OP, how old are yours?

Last edited by Cab_Burge; 07/20/21 12:16 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)