Jut a couple of quick questions. Did you reuse the same rocker nuts that were on the heads, the heads your using. If you did reuse the stock rocker nuts that was the start of your problem, & your lucky that the valves didn't loosen up sooner. Stock rpcker nuts are mainly a time use nut. They are designed to be a (crush) nut & are made to be put on once at the 23 lbs torque & left alone. If you want to reuse Pontiac rockers you have to buy a new set. There not chevy nuts. Did you resue the nuts.? Also what is the lift of the cam. Probely not a problem becaus you said you didn't hrear it right away. So if you did get rid of them right away & get some ploy-loc's & make sure you don't huet it again , ause it will sneak in the window at & give you bad dreams.
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