Product details:

Cloyes, Billet 9-Keyway Timing Set, Chev SB Chev SB, w/Torrington Bearing Premium SAE 1144 billet steel machined on state-of-the-art CNC equipment. This insures consistent quality, and eliminates the dreaded "run-out" found on inferior products. Sets include a 9-keyway crank sprocket, along with a .250" diameter True Roller chain. 100% manufactured by Cloyes in the USA.