QUICK ADJUST Allows for Infinite Valve Timing Adjustability of +/-6 Degrees to Tune for Maximum Engine Performance Output. Two Piece Camshaft Sprocket Design Featuring 6 Locking Cap Screws for Maximum Clamp Load. Includes an Accessory Adjustment Tool. Both Billet Steel Sprockets are Heat Treated for Durability. TRUE Roller 0.250" Roller Diameter "Z" Chain for Reduced Friction. "Z" Chain Approximately 33% Overall Increased Strength Over the Standard High Performance Chain. "Z" Chain Featuring a Press Fit Center Link design that Increases Load Distribution with Heat Treated and Processed Links to Maximize Ultimate Breaking Strength while Remaining Ductile for Toughness and Pre-stressed to Increase Fatigue Life. Includes Captured Needle Camshaft Sprocket Thrust Bearing to Minimize Block Thrust Surface Friction. 3-Piece Sets Hand-Matched to Qualify the Correct Center Distance and Minimize Runout.