I have Howard's Cams full roller rockers on SBC350. I had my head under the hood this weekend while the motor was idling and I heard some intermittent clacking. Part of me was hoping that a rocker stud was starting to pull out, so it would give me a great excuse to get screw in studs, but that does not seem to be the case. I think a few of the poly locks backed out to just around 0 preload or less. What is the trick to get them in place? I had the set screws pretty tight as I experienced a lock that backed out A LOT right after the engine was first rebuilt.
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