The Gen V 5.3 Truck Norris grind is a popular choice for those looking to delete DOD/AFM on their L83/L86 engine, or to just add that aggressive idle everyone loves. With great power gains and OEM driving characteristics, this camshaft works well with stock converters. Specs: 21X/22X, .540"/.540", 111 LSA, 14% fuel lobe INTAKE LOBE LIFT @ TDC: 0.0474