 For OMC, Johnson/Evinrude engines manufactured before 1979
Stroke: 3.1" (80 mm) |  For Mercury and Mercruiser engines
Stroke: 3.75" (95 mm) |  For use with inboard, sterndrive, and O/B engines
with appropriate accessories.
Stroke: 3.4" (87 mm) |
 For Johnson/Evinrude, OMC engines manufactured after 1979
Stroke: 3" (75 mm) |