 SC450, SC490, and SC540 Callaway SportTrucks were introduced in 2011, built upon the Silverado, Avalanche, Tahoe, Suburban, and (gasoline-engine) 2500HD-series trucks.For the 2014 model year, the SportTruck series gained power with the new GM Direct Injection V8 engines as the basis.5.3L engines were up from 450 hp to 460 hp.