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My old 93 always had a piston slap type tapping noise. It would get a little louder when the car wanted an oil change and would quiet back down with fresh oil. I was running a Powerdyne 4.5 lb supercharger on it and went with Mobil1 15W40 or 20W50. The car had 74K on it when I sold it and never had any real problems with the motor. What oil filter are you using?
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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