LS LOWER TIMING CHAIN CRANK GEAR 12556582 Performance timing sprockets are designed to deliver strength and accuracy for many miles of dependable service. These sprockets are made from high-quality materials and are a vital link for engine timing. Fits 1999-2013 LS-Based V8 Engines 4.8L 5.3L 5.7L 6.0L 6.2L LS1 LS2 LS3 LS6 L99 LS4 LS9 LSA LQ4 Fits all LS engines except LS7 and LS9