This Gen V Viper V10 engine received a 9. 0L Xtreme build by Prefix Corporation, featuring an aluminum block, custom fixed camshaft, Callies crankshaft and connecting rods, forged pistons, and CNC cylinder heads. The naturally aspirated engine produced 820 horsepower and 777 lb-ft of torque on a dynamometer, and has not been run or installed in a car since.