Can someone explain just a bit more on that o clearance as I seem to have same problem freshly built engine noisy roller rockers. When you wind down and get 0 play on the roller wont it adjust itself by pumping up lifter different next time around, I adjusted all of mine "pedestal mounted" locked them up with internal grub screw ran the engine, and it was tappety so ripped the covers off and all rockers that werent in there cam movement had lots of play. If I adjust them again will this not keep happening. I know im missing something but just cant work it out