Hennessey Goliath 650 Supercharged GMC Sierra 1500 AT4 Hits the Dyno, Lays Down 516 HP

On December 12, the mad folks at Hennessey Performance Engineering rolled out the Goliath 650 supercharged upgrade for the GMC Sierra 1500 with the 6.2-liter small block. In combination with a Whipple-supplied blower, the L87 EcoTec3 engine belts out 650 horsepower (as the name implies) and 658 pound-feet (892 Nm) of tire-shredding twist. How much of that actually gets to the wheels? The bearer of serial number 001, the half-ton pickup tr... (continue reading...)