4.8 5.3 Gen 3/4 LS Engines
LR4 LY2 L40 LY2 L20 LM7 L59 LS4 L33 LM4 LY5 LMG LH6 LC9 LH8 LH9
The Gen III engines were used from 1997 through 2002. These engines used a 24x crankshaft trigger wheel and a cam sensor mounted at the rear of the block. In 2003, GM introduced its Gen IV engine. The main identifier is a 58x crank trigger wheel with the cam sensor moved to the timing chain cover.