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Did exactly that very procedure, a procedure I have done many times before with consistent success. I also have a second muscle head person assisting and we have done the procedure several times with the same results from 1/2 turn to 3/4 turn preload. No change, we're stumped.

I agree posted above my push rod length probably can have some fair tolerance for length as long as the geometry with the rocker is right and adjuster falls in its correct range.
Looking again at this sharp grade very short duration 564 high lift cam, could my lifters be skipping... catching air (per-say), I ponder would stronger springs keep them planted and reduce the rocker noise?



What is the open load of the springs that are in use ? Have they been rechecked with a gage against the spec they say they are ? On a xe274 I used 120 on the seat and close too 300 open load I believe and that is good for rpm up too 5,500.

logan426