The new LSX454 crate engine displaces 7.4L and produces 638hp (476kW)Enlarge Photo
The LSX454 (part number 19166972) measures 7.4L in displacement and is rated at 638hp (476kW) and 600lb-ft (813Nm) of torque, which means the naturally aspirated mill almost matches the 638hp (476kW) and 819Nm (604lb-ft) of torque from the supercharged LS9 found in the Corvette ZR1 supercar.
The new engine is built on the same LS9 cylinder block but features new six-bolt LSX cylinder heads and a forged rotating assembly. Interestingly, GM is offering the ZR1 mill as a crate engine as well. The standard G8 GXP, meanwhile, features a 6.2L V8 engine rated at 415hp (309kW) and 415lb-ft (562Nm) of torque.
In addition to the LSX454, the SEMA G8 GXP comes with a standard Hydra-Matic 6L80 six-speed automatic transmission, a lowered ride height, stiffer springs, and the same brake package from the Cadillac CTS-V. Other details include 20in aluminum wheels with a black chrome finish, a custom bodykit, and sports exhaust system.