I stand corrected the last cat was a 09 C7 300hp.

It now a cummins are a 6.8 v10

Starting with the 2010 model year, only one diesel option was available due to Caterpillar's current absence in the OTR market. The 6.7 L Cummins B Series engine(ISB) I-6 diesel comes with 8 standard and optional ratings, and two vocational ratings.[2] Ford has announced that for the 2012 model year there will be gasoline and compressed natural gas options available for the F-650. The 6.8 L Ford Modular engine V-10 produces 362*hp and 457*ft·lbs of torque and will be mated to Fords new 6R140 6-speed automatic transmission.[3]