Sorry, I should have clarified. A "12V Cummins" is a 5.9L Cummins Diesel engine with 12 valves (one intake and one exhaust valve for each of the 6 cylinders.)

Sorry, I should have clarified. A "12V Cummins" is a 5.9L Cummins Diesel engine with 12 valves (one intake and one exhaust valve for each of the 6 cylinders.) It is a popular (and reliable) diesel engine used in older Dodge Ram pickup trucks.