I have a V-8 chevy Omc Cobra and #8 cylinders sucked a valve in last year, it was taken apart and the heads were done and reinstalled. Just ran it again the other day to the slip for 25 minutes and was ok, After sitting for hours we took it back out and after runnong it up for 10 minutes the rpms dropped we babied it back in and took it apart and the same cyl sucked a valve? Manifold? Riser?
