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  1. C3L81GUY

    Help! Loud tapping/knocking noise after warm up

    Hello everyone! I have a 1981 with the original L81 (190 HP) in it with 87,000 original miles, side pipes but no headers. Other than the side pipes, everything else is original, decent shape. Today I started it up and let it idle in the driveway, hood open. After about 5 minutes I heard a loud...
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