MerCruiser GM Engine Identification - boatfix.com

1 97-6 1199 Printed in 1 -service bulletinNo. 97-6TO: SERVICE MANAGERTECHNICIANSPARTS MANAGERR evised November 1999 MerCruiser GM Engine IdentificationModelsAll MerCruiser GM models 1974 and Engine CodesThe model of MerCruiser Engine can be determined by looking at the last letters of the Engine codethat is stamped in all complete long blocks by GM at the time of the Engine serial number, and/or model decals are missing, the Engine code will help to determinethe Engine model. Refer to drawings for Engine code you need from the Engine code, example s model year. In this case 1997, but it could also be 1987 or of Engine . A 350 cid V8, MerCruiser models , 350 Mag MPI, Black Scorpion Ski, - 4 and 6 Cylinder Engines (Next to Distributor).b - V6 and V8 305, 350 cid, V8 Gen V and VI 454, 502 cid and V8 L29 454 - V8 Mark IV 454, 2 -97-6 1199 ModelGMCodeCommentsFlywheelDiameterin.

2 (mm)GM 4 Cylinder 153 cid with Flat Lifters. Sterndrive Models (LH rotation). (324) (324)GM 4 Cylinder 181 cid with Flat Models (LH rotation).140RA1974-1986, cyl. (324) , cyl. (324) , cyl. (324) , cyl (324) , cyl. head, start of 1 piece rear (324) , cyl. (324) , cyl. head, stamped rocker arm (324) , start 14 in. flywheel, staggered starter mount14 (356) , cyl. head, start of 1 piece rear (324) , cyl. (324)GM 6 Cylinder 250 cid with Flat Model (LH rotation). (324)GM V6 229 cid with Flat models (LH rotation). (324)GM V6 262 cid with Flat or Roller Models (mechanical fuel pump, LH rotation). (324)1855KW1985, start of 14 in. (356)185KW1986, 6KW start of 1 piece rear (356)175KP1987, start of roller (356) (324)2055KR1985, start of 14 in. flywheel14 (356)205KR1986, 6KR start of 1 piece rear (356)205KR1987, 7KR start of roller (356) (356) (356) , special service long block for engines with mechanical fuelpump.

3 No intake, flywheel or balancer on long block. Can be used on2 or 4 bbl V6 262 cid Gen II with Roller Models (LH rotation). , 2KP start of electric fuel (356) , 3LJ start of balance shaft (356) , 5LJ start of plastic front (356) , 2KR start of electric fuel (356) , 3LJ start of balance shaft (356) , 5LK start of plastic front (356)- 3 -97-6 1199 ModelGMCodeCommentsFlywheelDiameterin. (mm)GM V6 262 cid Gen+ with Roller Models (LH rotation). , 9LJ start of metric fasteners,0LJ start of roller (356) , 9LK start of metric fasteners,0LK start of roller (356) XLJ1996-1997, 6LJ start of Gen+.14 (356) , 6LK start of Gen+.14 (356)262 Mag. EFILK1996-1997, 6LJ start of Gen+.14 (356) EFILK1998-UP, 9LK start of metric (356)GM V8 305 cid with Flat Models (LH rotation.)898MN1977-1980, (324) (324)228MJ1977-1980, (324) (324) (324)200MY1985, start of 14 in.

4 Flywheel14 (356)200PY1986, start of full circle rear (356)200PC1987, start of new cylinder (356) (324)230MZ1985, start of 14 in. flywheel14 (356)230PZ1986, start of full circle rear (356)230PD1987, start of new cylinder (356) (356) (356) (356) (356)Inboard Models (rotations shown).198MR (MS)1977, LH (RH).14 (356)228MA (MB)1977-1980, LH (RH).14 (356)230MA (MB)1981-1985, LH (RH).14 (356)230PA (PB)1986, LH (RH), start of full circle rear (356)230PF (PH)1987, LH (RH), start of new cylinder (356) (PH)1988, LH (RH).14 (356)GM V8 305 cid Gen+ with Roller Models ( MerCruiser intake manifold, LH rotation). , 2 bbl carb, 0ZA start of Toluca (356) EFIZA1998-UP, 0ZA start of Toluca (356)- 4 -97-6 1199 ModelGMCodeCommentsFlywheelDiameterin. (mm)GM V8 350 cid with Flat Models (LH rotation.) (324) (324)260WT1978-1980, (324) (324)260WB1985, start of 14 in.

5 Flywheel14 (356)260AB1986, start of full circle rear (356)2607AB1987, start of new cylinder (356)350 MagnumAB1986, start of full circle rear (356)350 MagnumAS1987-1990, start of new cylinder heads, GM (356)350 MagnumMS1990-1991, GM (356) (356) (356) , 2 bbl (356) BravoAS1989-1990, start of new cylinder heads, GM (356) BravoMS1990-1991, GM (356)Ski Models (rotations shown). (WR)1985, LH (RH).14 (356) (AR)1986, LH (RH), start of full circle rear (356) (AR)1987-1990, LH (RH), 7AB (AR) start of new (356) (MR)1990-1993, LH (RH).14 (356) (NR)1993-1995, LH (RH).14 (356) , LH, start of 2 bbl (356)Inboard Models (rotations shown).255WH (WJ)1975, LH (RH).14 (356)255WN (WR) 1976-1980, LH (RH).14 (356)260WN (WR) 1981-1985, LH (RH).14 (356)260AN (AR)1986, LH (RH), start of full circle rear (356)260AN (AR)1987, LH (RH), 7AN (AR) start of new cylinder (356) (AR)1988-1990, LH (RH).

6 14 (356) (MR)1991-1993, LH (RH).14 (356) (NR)1993-1995, LH (RH).14 (356)Hi-Performance Sterndrive Models (GM hi-rise, 4 bolt mains, LH rotation). (324)300 (324)300 TempestAK1986, start of 14 in. flywheel, full circle rear (356)HP320 EFIAK1987-1989, Mercury Marine multi-port (356)- 5 -97-6 1199 ModelGMCodeCommentsFlywheelDiameterin. (mm)GM V8 350 cid with Roller , Ski and Inboard Models (LH rotation). , GM hi-rise, Bravo (356) , GM hi-rise, Bravo (356) , GM 2 bbl, sterndrive and (356) , GM (356)350 MagnumCD1991-1993, GM hi-rise, sterndrive and (356)350 MagnumMD1993-1997, GM hi-rise, sterndrive and (356)350 Mag MPIMH1995, multi-port, (356)350 Mag MPIMH1995-1996, multi-port, (356) , GM hi-rise, (356)GM V8 350 cid Gen+ with Roller , Ski and Inboard Models ( MerCruiser intake manifold, LH rotation).

7 , sterndrive and ski, 2 bbl carb, 0MH start of To-luca (356) , inboard, 2 bbl carb, 0MK start of Toluca (356) EFIMH1998-UP, sterndrive, (TBI), 0MH start of Toluca production. 14 (356) EFIMK1997, inboard, (TBI).14 (356) EFIMH1996-1997, 6MH start of Gen+, Bravo, (TBI).14 (356)350 Mag EFIMH1996-1997, 6MH start of Gen+, Alpha and ski, (TBI).14 (356)350 Mag MPIMH1996-1997, 6MH start of Gen+, Bravo, (356)350 Mag MPIMH1998-UP, sterndrive and ski, multi-port, 0MH start of (356)350 Mag MPIMK1998-UP, inboard, multi-port, 0MK start of Toluca ScorpionMH1996-UP, 6MH start of Gen+, ski, multi-port, 0MH start ofToluca (356)Scorpion 377MH1997, ski, multi-port, built by Mercury Hi-Performance14 (356)GM V8 454 cid Mark IV with Flat Models (LH rotation).330 TR/TRSXS1977-1981, Mercury (356)330 (B-W)XY1982-1987, TR/TRS, Borg-Warner (356)454 MagnumXS1986-1988, (356) MagnumXS1988, (356)454 MagnumXA1988-1992, GM hi-rise, (356) , start of 4 bolt main, (356)Inboard Models (rotations shown).

8 330XN (XR)LH (RH), 454 cid, (356)330XY (XZ)LH (RH), 454 cid, (356)340XY (XZ)LH (RH), 454 cid, 1981-1984, (356)340 XYY(XZZ) LH (RH), 454 cid, (356)350XB (XC)LH (RH), 454 cid, (356)- 6 -97-6 1199 ModelGMCodeCommentsFlywheelDiameterin. (mm)GM V8 454 cid Mark IV with Flat Lifters Models (rotations shown) (XZ)LH (RH), 454 cid, (T05209XZ), start of 4 bolt (356) , 454 cid, (356)Hi-Performance Sterndrive Models (GM hi-rise, 4 bolt mains, LH rotation).400 (356) (356)370HF1986-1987, start of new lifter, camshaft, oil (356)400 (356) (356) (356) (356)440 (356)475 TurboXF1981-1985, turbo (356)HP525 SCXF1991-1993, (356)GM V8 454 cid Gen V with Flat , Ski and Inboard Models (4 bolt mains, LH rotation). , 1XW start of Gen V, (356) MPIUC1996, Bravo, (356) , 2XY start of Gen V, (356) MPIUD1995-1996, inboard, (356) PT Bravo 3UW1993, cast pistons, GM (356) PT Bravo 3UB1993-1994, forged pistons, GM (356) PT Bravo 3XX1994-1996, new design cast pistons, GM (356)454 MagnumXA1992-1996, 2XA start of Gen (356)454 (356)454 Magnum MPI UA1994-1996, Bravo and ski (356)Hi-Performance Sterndrive Models with (GM hi-rise, 4 bolt mains, LH rotation).

9 (356) (356)HP525 SCUA1993-1996, (356)GM V8 454 cid Gen VI with Roller , Ski and Inboard Models (4 bolt mains, LH rotation). (carb)XW1996-1997, 6WX start of Gen VI, (356) EFIUJ1996-1997, 6UJ start of Gen VI, Bravo, (TBI).14 (356) MPIUC1996-1997, 6UC start of Gen VI, Bravo, (356) (carb)XY1996-1997, 6XY start of Gen VI, (356) EFIUK1996-1997, 6UK start of Gen VI, inboard, (TBI).14 (356) MPIUD1996-1997, 6UD start of Gen VI, inboard, (356)454 Mag (carb)XA1996-1997, 6XA start of Gen VI, GM (356)454 Mag MPIUA1996-UP, 6UA start of Gen VI, Bravo and ski, (356)454 Mag MPIUF1998-UP, Gen VI, Horizon inboard, (356)- 7 -97-6 1199 ModelGMCodeCommentsFlywheelDiameterin. (mm)GM V8 454 cid Gen VI with Roller Lifters Sterndrive Models (GM hi-rise, 4 bolt mains, LH rotation).HP525 SC (carb) UA1996-1999, 6UA start of Gen VI, (356)GM V8 454 cid L29 with Roller and Inboard Models (GM multi-port, 4 bolt mains, LH rotation).

10 MPIXW1998-UP, 8WX start of L29, (356) MPIXY1998-UP, 8XY start of L29, (356)GM V8 482 cid Mark IV with Flat Sterndrive Models (GM hi-rise, 4 bolt mains, LH rotation).460 (356)GM V8 502 cid Mark IV with Flat and Inboard Models (GM hi-rise, 4 bolt mains, LH rotation).502 MagnumFJ1990-1992, Mark IV, (356)502 MagnumFH1992, Mark IV, inboards converted to MCM this (356) , (356)Hi-Performance Sterndrive Models, (4 bolt mains, LH rotation). (356)HP600 SCFJ1991-1992, (356)GM V8 502 cid Gen V with Flat and Inboard Models (4 bolt mains, LH rotation).502 MagnumFJ1992-1993, 2FJ start of Gen V, GM hi-rise, (356)502 Mag MPIFJ1993, multi-port, (356)502 Mag MPIHJ1993-1996, multi-port, (356) , 3FH start of Gen VI, GM hi-rise, (356) MPIHH1996. multi-port, (356)Hi-Performance Sterndrive Models (4 bolt mains, LH rotation).