GM 6.2 Diesel Engine 

Those exhaust manifolds are HMWWV specific though.

Earlier 998’s were 6.2 …the A1’s started the 6.5 series.

That 6.2 has a M998 fan clutch setup. The CUCV 6.2 had a vacuum pump in the rear. That engine has a tach adapter for the M998.

I've been told by the Square Body Mafia that 6.5's are still being produced in Mexico as a few South American militaries still use the CUCV. They can be shipped to the U.S. duty free under the NAFTA.

@@dw7094 They're still produced by AM General as well (the 6.5).