Can you tell which bank is noisy or are both banks noisy? You may have an adjuster that loosens up. I found 4 out of my 16 that are loose. Napa can
special order them from Sealed Power if you need replacements. It is possible you have a broken spring or a bent pushrod. It is messy business but you can run the engine at a slow idle to figure out which ones are noisy. Use a mechanics stethoscope to narrow down the noise. You can adjust the valves tighter but by only a couple thou. It's hard to diagnose noises over the net but I can give you some suggestions that may help. toolman
