Chevy 5.3 Engine VehicleHistory
The Vortec 5300 came in a few different variants The LM7, LM4, L33, and the L59. The LM7 Vortec 5300 is the truckuse variant of the LS engines found in Corvettes and Camaros. Unlike the LS engines, though, the LM7 engine block is composed of cast iron rather than aluminum. The cylinder heads, however, are aluminum.