Hustler CT525 Grind with .004" more lift and +15 degrees more duration. Best for tracks that just check lift. Not a drastic sound change.
See 54-697-11 for Stage 2
Fits 4.8, 5.3, 5.7, 6.0, 6.2 and 7.0 Liter LS1, LS2, LS3, LS4, LS6, LS7 plus SUV and Truck Engines (Grinds are specific to displacement and cylinder head design)