Ram Magnum Engine Specs

Bore, stroke, displacement and compression for all 13 Ram Magnum engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	226–488 ci
Cylinders	6, 8, 10
Bore	3.661–4.000"
Stroke	3.311–3.882"
Compression	8.4–9.7:1
Advertised power	125–310 hp
Years	1974–2009

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
Magnum · 4.000" × 3.882" · 8.4:1	488 ci	4" × 3.8819"	8.4:1	300–310
Magnum V10	488 ci	4" × 3.8819"	—	300–310
Magnum · 4.000" × 3.598" · 9.1:1	360 ci	4" × 3.5984"	9.1:1	245
Magnum 5.9	360 ci	4" × 3.5984"	—	230–250
Magnum · 3.909" × 3.311" · 9.1:1	318 ci	3.9094" × 3.311"	9.1:1	230
LA 318	318 ci	3.9094" × 3.311"	—	—
Magnum 5.2	318 ci	3.9094" × 3.311"	—	220–230
Magnum · 3.909" × 3.311" · 9.1:1	239 ci	3.9094" × 3.311"	9.1:1	175
TBI	239 ci	3.9094" × 3.311"	—	125
Magnum 3.9	239 ci	3.9094" × 3.311"	—	175–180
LA 3.9	239 ci	3.9094" × 3.311"	—	125
37 Magnum	226 ci	3.6614" × 3.5748"	9.7:1	215
PowerTech 3.7	226 ci	3.6614" × 3.5748"	—	210

Factory cars with a Magnum

• Dodge Ramcharger: 1974; 1975; 1983; 1984; 1985; 1986; 1987; 1993, 230 hp
• Dodge D-Series Pickup: 1984; 1985, 175 hp; 1986; 1987; 1988, 125 hp; 1988, 185 hp; 1990, 125 hp; 1990, 190 hp; 1991, 125 hp; 1991, 190 hp; 1992, 180 hp; 1992, 190 hp; 1993, 180 hp; 1993, 230 hp
• Dodge Dakota: 1987, 125 hp; 1988, 125 hp; 1989, 125 hp; 1990, 125 hp; 1991, 125 hp; 1992, 180 hp; 1993, 180 hp; 1994, 175 hp; 1995, 175 hp; 1996, 175 hp; 1997, 175 hp; 1998, 175 hp; 1998, 250 hp; 1999, 175 hp; 1999, 250 hp; 2000, 175 hp; 2000, 250 hp; 2001, 175 hp; 2001, 250 hp; 2002, 175 hp; 2002, 250 hp; 2003, 175 hp; 2003, 250 hp
• Ram 1500: 1994, 175 hp; 1994, 220 hp; 1994, 230 hp; 1995, 175 hp; 1995, 220 hp; 1995, 230 hp; 1996, 175 hp; 1996, 220 hp; 1996, 230 hp; 1997, 175 hp; 1997, 220 hp; 1997, 235 hp; 1998, 175 hp; 1998, 230 hp; 1998, 245 hp; 1999, 175 hp; 1999, 230 hp; 1999, 245 hp; 2000, 175 hp; 2000, 230 hp; 2000, 245 hp; 2001, 175 hp; 2001, 230 hp; 2001, 245 hp; 2002, 245 hp; 2003, 245 hp
• Ram 2500 and 3500: 1994, 220 hp; 1994, 230 hp; 1994, 300 hp; 1995, 220 hp; 1995, 230 hp; 1995, 300 hp; 1996, 220 hp; 1996, 230 hp; 1996, 300 hp; 1997, 235 hp; 1997, 300 hp; 1998, 250 hp; 1998, 300 hp; 1999, 245 hp; 1999, 310 hp; 2000, 245 hp; 2000, 310 hp; 2001, 245 hp; 2001, 310 hp; 2002, 245 hp; 2002, 310 hp; 2003, 310 hp
• Dodge Durango: 1998, 245 hp; 1999, 175 hp; 2001; 2002; 2003; 2004, 210 hp; 2005, 210 hp; 2006, 210 hp; 2007, 210 hp; 2008, 210 hp; 2009, 210 hp
• Jeep Grand Cherokee: 1998, 245 hp

What varies across the family

Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.

9 of 13 are oversquare — bore larger than stroke, which favours revs over low-end torque.

Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.

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