lifter preload w/adjustable rockers

RammerJammer75 said
That seems like a ton of preload to me. I've only built one roller engine, but I set it at 3/4 and it was quiet as a church mouse. Interesting though.

Roller profiles are such that they try to "throw" the lifter when the ramp comes around. By reducing the amount the plunger can travel, you counteract that inertia.