I own a 2002 Z28 Camaro with an LS1 engine. Mine has a knock and piston slap. I know that LS1's have this problem and I had mine in the dealer to have a pinon seal that was leaking fixed so I asked the to listen to my car's "slap". Well I didn't expect them to say much and do nothing about it as it was "normal"(most folks don't seem to get much help with this problem from the dealer)but then said they heard it and it was not normal so they want ot rebuild the lower end with new pistons and rings and a bunch of other parts! I never even had to ask twice for them to do this!!! Well some folks on the Camaro forum are telling me not to let the dealer touch the engine.Becides the "slap" and a little oil burning it runs strong and according to UOA it is wearing excellent and has the best combustion efficiency of any LS1 they(lab)have seen. So some of those guys are saying to leave it alone. The dealer says they have a fix for the "slap". I know alot of LS1 owners are trying to get this done for their LS1's so I think I'm going to do it. I have one week till they tear into her. So if anyone knows if there are any pros or cons about this please let me know. Appreciate any thoughts!