JP Engineering induction hardens all crank sprockets for all chain sets, crank gears for full steel timing gear sets and oil pump drive gears. Induction hardening is used to improve tooth life of gears and sprockets as well as pre-work hardening gears and sprockets before they are installed onto engines. Induction hardening is a process where steel is hardened by means of induction heating and subsequent quenching in water. Advantages of induction hardening gear and sprocket teeth include: Localised hardening of tooth surfaces where hardness is needed. Unlike case hardening which places a hard case around the entire surface of the part being hardened, induction hardening only hardens the area near the applicator coil which means that sprockets and gears will have hard teeth and not hard bores which can prematurely wear crankshafts. Hardened teeth are pre-work hardened. The process of induction hardening simulates work hardening in the engine. This means that the sprocket or gear is ready to be used without the wait of the normal work hardening period. Speed of hardening. Induction hardening is a rapid process. It takes approximately 30 seconds for a rod of parts to be completed. Depth of hardness is easily controlled. Since the process is computer controlled the depth of hardness is always the same and is easy to control. Induction hardening works by placing the part to be hardened inside an "applicator" coil of one or more turns, through which alternating current is passed. The coil, which in the case of gears and sprockets is round, is usually made of copper tubing which has water passing through it to prevent the coil from overheating. The piece to be hardened is rotated within the applicator coil. At JP Engineering multiple pieces are hardened at the same time by placing the sprockets or gears onto a rod and then rotating the rod, heating the parts and then feeding the rod downward into the quench water. JP Engineering are the only manufacturers of induction hardened sprockets and gears in Australia for the automotive aftermarket. Other companies that use induction hardened sprockets and gears include GM, Ford and Edelbrock.Pit Stop USA offers JP Performance SB Chevy Billet Double Roller Timing Set - SB Chevy 265-400 - Reverse Oiler - +.005" 5981T-LB5 at low everyday prices. Be sure to check out all of our products from JP Performance including JP Performance Timing Chains - Small Block Chevy.