Marine grade that meets SAE J1171 and ISO 8846 standards and High quality magnets/field coils provide better starting torque Replaces: Chris-Craft 16.61-00042; Arco 30460; GLM 74150; Volvo Penta 834893-0, 855326-5; OMC 981078, 982121, 983444, 983790, 985966; MerCruiser 50-17251A3, 50-76965A4, 50-99417A2, 50-99419A3, 50-77328A3, 50-806964A3, 50-807904A1, 50-864340A2, 50-864340R03 Fits: GM Engines, bottom mount, straight across bolt pattern: 100-245HP, 1970-1978; GM (Chevy) MerCruiser, OMC, Volvo 3.0, 5.0, 5.7 & 7.4 Liter Sterndrive Engines prior to 1987 with 2-piece rear main seal Double sealed housings along with High quality brushes for Longer Service Life All Sierra parts qualify for and are covered under Sierra's Industry Leading Customer Satisfaction Warranty Fit type: Universal Fit