Speedmaster PCE264.1025 Timing Chain Set allows you to advance or retard your timing 6 degrees without having to remove your valve covers or having to back off your rocker arms. Exact radial run-out tolerance insures your timing adjustments are accurate. Features a billet cam and crank sprocket, the crank sprocket is also heat-treated for additional strength. A heavy-Duty roller chain and one-piece roller thrust bearing assembly insure smooth operation.