Earlier this year, Tuscany Motor Company pulled the wraps off of the first-ever Harley-Davidson GMC Sierra, which features unique exterior styling elements, Harley Davidson branding and other upgrades designed to make the truck the perfect rainy-day vehicle for an enthusiastic Harley owner.
Now, Hennessey Performance Engineering has applied its engine tuning expertise to a customer’s 2020 Harley-Davidson GMC Sierra, making this rare and distinctive truck that much more special.
The customer instructed Hennessey to install their HPE700 package on the truck, which bumps the output of the pickup’s GM 6.2L L87 V8 engine from 420 to 700 horsepower. This rather large power increase comes from a 2.9L supercharger, along with CNC ported cylinder heads, a high-flow intake, Hennessey camshaft and reflashed ECU.
A 280-horsepower bump is very significant – even on a big, heavy, aerodynamically challenged vehicle like the GMC Sierra. HPE says an HPE700-equipped Sierra will hustle from 0 to 60 mph in just 4.3 seconds, more than two seconds quicker than a stock L87 V8-powered model.
The 2020 Harley-Davidson GMC Sierra features a number of exterior and interior modifications, including a hard tonneau cover embossed with a large Harley-Davidson crest, Harley Fat Boy-inspired 22-inch wheels, a custom tailgate, custom orange accented grille, vented hood and milled black exhaust tips. The truck also gets diamond-stitched leather seats with contrasting orange stitching, Harley-Davidson seat badges and other Harley-branded add-ons.
A stock 2020 Harley-Davidson GMC Sierra will cost just under $100,000 new, so it’s safe to say that this is one very expensive truck after the Hennessey modifications. It was also limited to only 250 units, though, so anyone lucky enough to get their hands on one can stand proud knowing they’ll probably never see another one while out on the road.
See Hennessey’s tuned Harley-Davidson GMC Sierra in action in the video embedded below.