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Yeah, keep it under 6 lbs on a stock LT1. The ringlands are really thin on those pistons. I ran 4.5-5 lbs of boost on a Powerdyne for almost 5 years on my old 93 LT1 with no problems. I bought a 6 lb pulley but kept reading about guys taking out the pistons even at 6 lbs so I kept the 4.5 pulley on the supercharger. I think I put 40-42K miles on it with the supercharger so they can survive.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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