My 67 427/400 has some light valve clatter. Since this motor has hydralic lifters I thought I would leave it alone. I don't have the experience to adjust my self. I'm concerened about overtightening. What are you thoughts about this. The little chatter doesn't bother me. As long as it doesn't bother motor. I think I should learn to be more mechanical.I alway held the belief that small clatter is all right. Am I wrong. Thank you, Don