We’ve covered Michigan-based Hummer shop Milspec’s various projects quite extensively in the past. The company specializes in restoring and re-imagining the iconic Hummer H1, and while most of their projects lean into the off-road prowess of the military vehicle, they recently developed a different kind of H1.
You see, Milspec’s various Hummer H1 projects are powered by the 6.6-liter Duramax V8 engine. They don’t just drop in a stock Duramax V8, though—they are upgraded to produce as much as 500 horsepower and 1,000 pound-feet of torque. For that reason, the company has a military Hummer H1 powertrain mule, which is used to develop the 6.6-liter Duramax V8 engine and ensure it works properly in their custom Hummer H1 projects.
Milspec then got the idea to up the ante on their powertrain mule and turn it into a track-ready, 800-horsepower beast. YouTube channel Seen Through Glass recently visited Milspec in Detroit to test out this oddball track-day Hummer H1, taking it for a spirited drive on Michigan roads to prove that it isn’t just for show.
In addition to an 800-horspeower turbo-diesel V8, Milspec’s track-day Hummer H1 also features a completely rebuilt coilover suspension, large alloy wheels shod in Pirelli P Zero tires and Wilwood brakes. The racing inspiration continues inside with four Sparco race seats and a Momo racing wheel.
Milspec actually takes this mad creation to autocross events and even track days at Michigan’s M1 Concourse track. They maintain that it actually handles and brakes pretty well, and with a turbo-diesel V8 making 40 pounds of boost under the hood, it’s definitely pretty fast down the straights, too.
Ever wondered what a track-ready Hummer H1 would be like to drive? If so, check out the Seen Through Glass video embedded down below.