Ski Models (LH rotation), 4 bolt mains, flat lifters Modelġ994–1996, no mechanical fuel pump pad on cylinderblock, MerCruiser MPI intake GM V8 454 cid (7.4L) Gen V – Sterndrive Models (LH rotation), 4 bolt mains, flat lifters Modelġ992–1996, 1XW, start Gen V, no mechanical fuelpump pad on cylinder block, GM 4–bbl intakeġ993, cast pistons, start GM hi–rise intakeġ992–1996, 2XA, start Gen V, no mechanical fuelpump pad on cylinder block, GM hi–rise intake Inboard Models (rotations shown), flat lifters Model GM V8 454 cid (7.4L) Mark IV – Sterndrive Models (LH rotation), flat lifters Modelġ982–1987, TR/TRS, Borg–Warner transmissionġ988–1992, Bravo, T05209XW, start 4 bolt main, GM4–bbl intake The 350 cid V8 Mercruiser models 5.7L, 350 Mag Mpi, Black Scorpion Ski, etc. 7=General Motor’s model year in this case 1997, BUT this could also be 1987 or 1977. Information you need from the engine code, example M01187MH. Refer to the drawing below for the specific engine code location on your Mercruiser Engine. ![]() If the serial number and/or model decals are missing, the Engine code will help to determine the engine model. The specific model/vintage of Big Block V8 Mercruiser Engine can be determined by looking at the last letters of the engine code which is stamped by General Motors at the time of assembly on all complete Marine Longblocks.
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