For late model GM engines with 12-3/4" flywheel. Standard clockwise rotation. 96 and later 4.3L. 98 and later 5.0, 5.7L. Delco permanent magnet gear reduction 2 bolt starter. 12V 11-tooth offset bolt pattern. Mercruiser:50-81248A350-812604A250-822330A250-864340A2Volvo: 3856004-1OMC: 3854751