Replace your timing chain with a Speedway Tru-Gear Gear Drive. Unlike timing chains, gear drives will not stretch or wear prematurely under extreme conditions. The precision gear drives feature gears that are cut from billet steel and heat treated for extreme durability. Offset bushings allow for easy cam indexing and timing changes. Easy installation. Easy to install. SAE 660 bronze thrust ring. Rugged gear drives offer high-precision timing. Dual idler gears for more stability than single gear drives. Offset bushings for easy cam indexing (for most applications) Fits under most stock timing chain covers (occasional minor machining may be required)