Under the factory hood and surrounded by the custom cage is a 383ci Chevy small-block engine. Teeple estimates it produces 400 horsepower and 420 lb-ft of torque. The ’plant features KB forged pistons, Procomp 64cc aluminum heads, a Competition Cams camshaft and valves, Isky valve- springs, RPS roller rockers, an Edelbrock Performer Air-Gap intake manifold, Doug Thorley headers, and a Howell 670cfm TBI system. Amperage is produced by a 140-amp Summit Racing alternator and a underhood-mounted Optima RedTop battery along with a bed-mounted Optima BlueTop auxiliary battery. The engine is cooled by the GMC’s stock radiator fitted with a pair of Summit Racing 12-inch electric fans. Behind the engine is an NV4500 five-speed manual transmission.