For Evinrude / Johnson Engines 40 - 300+ HP
Model 503 Applications: Evinrude and Johnson : 2 cyl: 50 hp ('71-'74) / 45 to 55 hp Commercial / 3 cyl: 55 hp, 60 hp, 65 hp, 70 hp, 75 hp with large gearcase, 65 hp Commercial / 4 cyl: 75 hp, 85 hp, 88 hp, 90 hp, 100 hp, 110 hp, 115 hp, 120 hp (1986-94), 125 hp, 135 hp (1973-76), 140 hp (1977-84, 1986-94) / 4-stroke: 60 hp, 70 hp V4 Sea Drive 1.6L and 1.8L / E-TEC: 40 hp, 50 hp, 60 hp, 75 hp / 90 hp and 115 hp (20" shaft) / OMC Cobra 400 : Cobra 400:stern drives 2.3 to 3.0L (1978-89)
With 4-3/4" or 4-1/4" Gearcases, 13 Splines
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