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1. Test-fitting the engine into the C10 engine bay without the transmission or radiator installed. Note that LS2, LS3, LS7, LS9-powered Corvettes have a flat water pump pulley. If your donor engine came from an earlier-model Camaro or Trans Am, it also uses this type of water pump, but the Corvette balancer is 3/4-inch shorter for more radiator and electric fan clearance.