[RET_COP]

Comp Cams Retro roller lifters 8931-16 SBF and many others of the like call for .050-to .100 preload. It also states in the paperwork that I received 1 turn after 0 lash. 7/16-20 on a 1.6 scorpion rocker= .020 for every quarter turn. I measured this at the lifter. This paperwork is 2 months old. I set mine at 3/4 turn after 0 lash for .060 preload. Everything is working very well. Thread count, rocker ratios play the biggest part and to a very small extent the make of the rocker. Not all ratios have the same distances between fulcrum and roller tip and fulcrum and pushrod cup. The industry has no standard and that goes for heads and stud placement. It's a long story.