Seems all of mine have loosened sense I last checked them. Not by much but by enough to warrent my troubleing with um. Besides I was bored at the time. Now im busy as crap at work and havnt felt like screwing with it when I get home. So she sits, cams out waiting. Bucky, your points are well taken about performance. But even though I'v done many things to improve performance. Valve adjustment to the thightest setting would not, in my opinion provide enough of a difference to warrent the trouble. Perhaps if I were drag racing and trying to cut et's then it would be worth it. I do apprecitate your imput though, and agree with what you're saying.