[Gearhead999]

Are the cam and lifter new?? Are the valves new??

If you're adjusting them, Phillyfanfrombirth has the correct answer. I've personally ne ver had a problem adjusting any of them, including Ch**y's.

Back off or tighten down till it spins and tighten in 1/3-1/2 turns and lock it down. If ater a couple of time adjusting and you're still getting valve clatter, check the oil pressure and if it is OK replace the lifter.