BAD IN BLUE
A FULL-PULLING LB7 WITH AN 800HP ATTITUDE
The used Duramax market is teeming with buyers. Any time there’s a classic body style for sale, people know it—and if the price is right these pre-emissions trucks aren’t for sale very long. When this lowmile ’04 GMC Sierra 2500 HD went on the market six years ago, Chance Meyer wasted no time forking over the money for it. And then the mods began…followed by a second place finish the very first time he hooked it to the sled. At that point, you could say Chance fell—hook, line, and sinker—for the sport of truck pulling.
Playing for Keeps
With the amount of horsepower required to compete always on the rise in pulling, Chance decided to pull out all the stops and build the LB7’S bottom end in the summer of 2014. The competition-ready LB7 was put together by friend Andrew Karker of Illini Outlaw Diesel, and consists of R&R rods, 15:1 compression, fly-cut pistons from PPE, and a 192/200 Hamilton cam. The heads were ported, polished, and treated to stiffer valve springs courtesy of Premier Engine Design, while ARP studs fasten them to the block.
Big Sticks and Dual CP3’S
Thanks to a set of Exergy Performance 100-percent
over injectors, plenty of fuel is on the table. Adequate rail pressure is provided by a PPE Dual Fueler kit, complete with a stock displacement CP3 from an LBZ Duramax up top and a stroker pump in the factory location. A 150-gph FASS system satisfies the low-pressure fuel supply needs of the CP3’S.
Remote-mounted S300
In order to compete in his local Work Stock class, Chance has the option of running a stock-appearing turbo or a T4 flange S300 with an inducer no larger than 66mm. After exhausting the horsepower potential of a factory-based, IHI charger with a 66mm compressor wheel (making just over 700-rwhp), upgrading to an S366 SX-E was an easy decision. But instead of mounting the S300 in the valley (and because the Work Stock rulebook allowed it) Chance contacted Wehrli Custom Fabrication for one of its remote mount turbo kits. Locating the S366 SX-E above the passenger side fender makes swapping turbos a piece of cake and also frees up space in the lifter valley.
Competition A1000
The ability to survive somewhere between 750 and 800-rwhp called for a full competition build of the Allison transmission. Assembled at Illini Outlaw Diesel, the fortified five-speed makes use of a Sun Coast GMAX-5R-3 Alto rebuild kit, a billet C2 hub, and a triple disc Precision Industries converter. The Allison’s tail