1972 Mercruiser Specs

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    1972 Engines

    • In 1972, Mercruiser produced three engines in 3.0, 4.0 and 5.1-liter displacements. Five larger sterndrives were available at 215, 270 and 325 horsepower. All eight sterndrives were four-stroke engines with gear ratios that ranged from 1.32 to 1.98:1.

    Motor Specifications

    • Motor specifications varied according to engine size. The 5.7 liter GM 350 ci was an eight-cylinder engine that produced 270 horsepower. With a 15-spline count driveshaft, the GM 350 had a minimum and maximum wide-open throttle rating of 3,800 to 4,200 rpm.

    Propellers and Performance

    • All 1972 Mercruiser sterndrives required A-style propellers. Five A-style propellers were available for the GM 350, ranging in size from 15-by-11-inches to 15-by-17-inches. Two left-rotation propellers could be installed for dual engine applications. Depending on propeller size, the GM 350 could operate at speeds of about 25 to 45 mph.

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