Fully machined billet steel camshaft and crankshaft sprocketsNine keyway steel crankshaft sprocket enabling different settings: 0?, +/- 2?, +/- 4?, +/- 6?, +/- 8?Also includes offset cam bushings for 0?, +/- 2?, +/- 4?, or +/- 6? of timing when using the factory ECM computersRoller chain designed with .250" diameter rollersAvailable with or without a captive Torrington thrust bearing (73205 - without, 73206 - with)