Ram Cummins B Series Specs: 4.016 x 4.724 in

Ram Cummins B Series specs: 4.016 x 4.724 in (102 x 120 mm) bore and stroke, shared by all 8 versions. Displacement, compression and factory ratings.

At a glance

Displacement	359 ci
Cylinders	6
Bore	4.016"
Stroke	4.724"
Compression	16.3–17.2:1
Advertised power	160–325 hp
Years	1994–2007

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
59 Cummins 24V	359 ci	4.0157" × 4.7244"	16.3:1	235
59 Cummins 12V	359 ci	4.0157" × 4.7244"	17:1	160
ISB 5.9 Common Rail	359 ci	4.0157" × 4.7244"	17.2:1	325
Cummins 6BT 12-valve	359 ci	4.0157" × 4.7244"	—	175–215
Cummins ISB 24-valve	359 ci	4.0157" × 4.7244"	—	235
Cummins ISB 24-valve High Output	359 ci	4.0157" × 4.7244"	—	245
Cummins ISB common-rail	359 ci	4.0157" × 4.7244"	—	250
Cummins ISB common-rail High Output	359 ci	4.0157" × 4.7244"	—	305–325

Factory cars with a Cummins B Series

• Ram 2500 and 3500: 1994, 175 hp; 1995, 175 hp; 1996, 215 hp; 1997, 215 hp; 1998, 215 hp; 1998, 235 hp; 1999, 235 hp; 2000, 235 hp; 2001, 235 hp; 2001, 245 hp; 2002, 235 hp; 2002, 245 hp; 2003, 250 hp; 2003, 305 hp; 2004, 250 hp; 2004, 305 hp; 2004, 325 hp; 2005, 325 hp; 2006, 325 hp; 2007, 325 hp

What varies across the family

All are undersquare — stroke larger than bore, favouring torque low in the range.

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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