Mercruiser Block ID Codes - 4 Cylinder Marine Engines Mercruiser Block ID Codes – 4 Cylinder Engine. Information you need from the engine code, example M01187MH. 7=General Motor’s model year in this case 1997, BUT this could also be 1987 or 1977. MH = Type of engine. The 350 cid V8 Mercruiser models 5, 350 Mag Mpi, Black Scorpion Ski, etc. GM 4 Cylinder 153 cid (2) Sterndrive Models (LH rotation), flat lifters. I found a GM cast 4 cyl engine with cast Mercruiser May 21, 2011I found a GM cast 4 cyl engine with cast Mercruiser aluminum. Neither one engraved or etched letters or numbers. A casting number is XXXXX the right side of block just above the large GM: 27700. Just to the right of that number is XXXXX: L1073. Just below this number is XXXXX "Made in Mexico" in spanish. I could not find any other markings.
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