AM General engines

The 6.2-litre naturally aspirated V8 diesel of the square-body K-series and the CUCVs.

1 vehicle: M998 and M1038 cargo/troop carrier

The 6.2 and turbocharged 6.5-litre V8 diesels of GM’s trucks and the CUCV and HMMWV; the GEP Optimizer 6500 is its military rebuild.

9 vehicles: M1025 and M1026 armament carrier, M996 and M997 ambulance, M1045 TOW carrier, HMMWV M998 series (1984–) and 5 more

Cummins’ B-series six, 5.9 litres from 1989 and 6.7 from 2007, in the heavy-duty Rams.

1 vehicle: M939 5-ton 6x6 (1982–87, AM General)

The 6.6-litre Duramax V8 of the Silverado HD; the 3.0-litre Duramax six is a different engine of the same name.

2 vehicles: Hummer H1 (1992–2006), Hummer H1 Alpha (2006)

The 6.0 Vortec and 6.2-litre L92 V8s of the Hummer H2.

2 vehicles: Hummer H2 (2002–09), Hummer H2 SUT (2005–09)