In this video, I find out if this old vintage Wabco Haulpack Dump Truck fitted with v12 Supercharged Detroit Diesel GM will run after being retired from the quarry and left sitting for many years. These big 2 stroke diesels were fitted to some of this early earthmoving equipment back in the day, this 12v71 GM totalling 852cu and 425hp at the flywheel. These supercharged 2 strokes diesel gm screaming jimmy engines were fitted to various males and model of trucks and heavy equipment across the world over a number of decades.