Over the past few years, one of Armor Inc. Diesel & Suspension’s big focal points for performance engine work has been its Ultimate Callout Challenge (UCC) truck – a 2007 Dodge regular cab long box – which features a 6.7L Cummins engine. In the past four years, the truck has been rebuilt three times in order to compete at the UCC event where trucks must do a dyno pull, drag race and a sled pull. This 6.7L Cummins is our Diesel of the Week sponsored by AMSOIL.