Leaking exhaust

vendredi 29 août 2014

My new to me '94 30' LY M/H has a noise that sounds a little like a loose valve lifter but it goes completely away at idle and under light load. It gets loud under heavy load. Does this sound like an exhaust leak? I understand that the 454s are prone to cracked exhaust manifolds. I can't see any leak or obvious cracks. Could it be a worn rocker arm? I seem to recall that a loose rocker is noisy at idle? It's been many years since I've had this kind of problem and I guess I've forgotten more then I remember.




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