Thinking i may have a valve not seating or a slightly bent valve, crank the car and it seems to sound fine, rev the motor a couple times and as the rpms fall it sounds like a bad exhaust leak out the pass side header. While the engine is revved at 4-5000 rpm it doesnt skip a beat, only when ya back off the throttle and the rpms fall. It is a 602 crate motor, all cylinders on pass side has 150 compression. Could a weak valve spring cause it? Seems like if it were a valve spring it would do it while revving instead of after letting off the gas? Any help is appreciated
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