The naturally aspirated 6.2L V8 L87 engine in the 2019 to 2020 GMC Sierra 1500 works well right out of the box, providing 420 horsepower at 5,600 rpm and 460 pound-feet of torque at 4,100 rpm. However, Texas-based tuner Hennessey Performance Engineering isn’t known for being satisfied with “out of the box,” and offers a number of upgrades that take the Sierra’s V8 to all-new heights. Now, we’re getting a look at Hennessey’s supercharged Sierra Denali, a.k.a. “Goliath,” rip it up on the dyno.
This particular model is equipped with Hennessey’s 700-horsepower upgrade kit, which features a new 2.9L blower that breathes new life into the ‘eight with six pounds of boost. Complementary upgrades include a high-flow intercooler system, a new intake, a custom cam shaft, hardened pushrods, a new crankcase ventilation system, and custom engine management tuning.
According to Hennessey, the upgrades bring the GMC Sierra’s 6.2L L87 up to 700 horsepower at 6,300 rpm. Not too shabby for a pickup.
In addition to more power, Hennessey also offers a number of optional upgrades, including the HPE Goliath Off-Road Stage 1 Package, which adds in a new Goliath-branded front bumper, LED lighting, 20-inch 10-spoke wheels , 35-inch Toyo tires, and a six-inch lift, as well as some exterior graphics.
Buyers are also offered some branded interior upgrades, a ram air hood, Brembo front brakes, a cat-back exhaust, a retractable bed cover, upgraded electronic step-ups, and a Goliath rear bumper as well.
Check out this monstrous GMC Sierra do its thing on the dyno in this brief one-minute, 28-second video. Output at the wheels is measured at a maximum of 531 horsepower and 368 pound-feet of torque, which, according to Hennessey’s estimated 25-percent driveline loss (which includes the big wheels and tires), add up to about 700 ponies out of the V8.