Are the adjuster screws 3/8 fine thread? If so that would equate to .0416 per turn. So 1 1/4 turns come out to .0520 preload. They claim most lifters have up to .200 of adjustment for preload. If the Cam and lifter company is suggesting this I guess it is worth a try.
Pulled an adjuster this morning and they are 3/8 fine thread, they're in fact a 3/8 - 24 thread. I will go with a final 1 1/4 turn and see if it helps.
Thx
That's a bit too much preload IMO
BTW, There's an old saying about valves, It's better to hear them than to smell them
