the LM7 and Flex-Fuel L59 variants used cast iron engine blocks, and the LM4 and High-Output L33 variants featured lighter-weight aluminum block construction. All four Gen III Vortec 5300 variants ...
Over the following years, Chevrolet would use the engine for many of its vehicles ... Its four variants are the LM7, LM4, L33, and L59. The Gen III Vortec 5300 uses a 3.78-inch cylinder bore ...