67 GTO engine tapping
My 67 GTO has a stock 400 with 4 speed and has recently developed an engine knocking or tapping sound coming fron drivers side rear of engine. I already readjusted rocker arms, noise didn't change or get any better. Tapping changes with RPM's but doesn't get louder, only faster. Im thinking lifter or bearing going bad but can't determine exact location. Any ideas or how to diagnose?
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