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4.3L Alpha 4V EST Sterndrive Engine Only. 225 HP @ 4600 RPM, 4.3 Liter Fully Dressed Marine Engine. Engine Features: Special Flame Graphics, 600 cfm 4bbl Carburetor, Exclusive High-Torque Aluminum Intake Manifold with Bronze Water Crossover & Pads, Electric Fuel Pump, 2-Piece Wet Joint Exhaust, Nodular Iron Crankshaft, Billet Steel Roller Camshaft, Vortec Cast Iron Cylinder Heads, Stainless Steel Valves, 1.5:1 Roller Rocker Arms, EST Analog Ignition, 10-Pin Harness. Runs on 87 Octane Fuel. Replaces MerCruiser 4.3L & 5.0L sterndrive engines.