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2008 GMC Sierra 2500HD - Grudge Truck

Not Your Average LMM

Jason Sands
Jun 30, 2014
Photographers: Jason Sands
While it may be odd for some to see a newer diesel transformed into a drag truck, it’s happening more and more these days. What makes this case interesting is Anthony Pelayo’s Duramax-powered GMC Sierra doesn’t look nearly as fast as it really is. While folks are starting to get used to quick diesels, slammed and on 20s has most onlookers thinking “show truck.” That is, until they see the “Mean LMM” license plate.
If a racer is unlucky enough to line up against Anthony, a 1.55-second 60-foot time will be the next performance clue, as the stance of Anthony’s GMC helps resist the effects of weight transfer and makes sure all four tires claw at the pavement. After that, the GMC rockets down the quarter-mile in the low 11-second range, at more than 120 mph. You see, Anthony’s Duramax is a “grudge race” truck. It’s designed to prey on unsuspecting drivers during “run what ya brung” street car class races.
"I’ll stop modifying when I hit 9s..."
Photo 2/15   |   Anthony Pelayo’s GMC packs nearly 800 rwhp under the hood. The bottom end of the LMM Duramax is fortified with Carrillo rods, Mahle cast-aluminum racing pistons, ARP 625 Custom Age main and head studs, and a camshaft and valvesprings from SoCal Diesel.
Anthony’s GMC didn’t get this quick overnight, though. A lot of thought and effort went into making it this way. After he took a ride in his dad’s tuned 2005 Sierra a few years ago, Anthony knew diesel power was the way to go. Soon he had an 2008 of his own, which ran high 12s on basic upgrades, and 12 flat on nitrous. In the transmission department, Anthony didn’t mess around. He started out right with a built Allison 1000 from Inglewood Transmission, along with a Goerend torque converter. Then, in 2009, disaster struck, as the LMM engine cracked a piston.
Undeterred, Anthony built a second engine with even more performance in mind, as both turbo and fueling upgrades were added to the next 6.6L. Running high 11s on fuel only was fun -- until many hard dragstrip passes later, a second piston made its exit in 2011.
For the third time around, Anthony went with a full performance rebuild, including RDL up-pipes, Mahle 16.5:1 compression pistons, a SoCal Diesel camshaft, and ARP fasteners throughout. While the Duramax-powered grudge racer still runs 11s, Anthony hopes it will be more reliable in doing so, so he can get back to the business of leaving muscle cars in his wake.
Most likely, there will be more than a few racers that leave the track with stories about how they just got stomped by a four-door diesel truck -- a truck they mistook for just another lowered cruiser. And that’s just fine with us.
Photo 6/15   |   Anthony showed what his GMC was made of at a recent dyno day at Total Performance Diesel in Santa Rosa, California, where the truck put down 785 rwhp on fuel, and 813 rwhp with a small shot of nitrous.
Photo 10/15   |   Anthony also demonstrated his launch technique on a private side road. Notice how the lowered stance of the truck keeps the front end digging in, instead of toeing-in.
Photo 14/15   |   2008 GMC Sierra 2500HD Front Three Quarter 001

2008 GMC Sierra 2500 HD
OWNER: Anthony Pelayo
HOMETOWN: Vacaville, California
ODOMETER: 80,872 miles
ENGINE: 6.6L LMM Duramax V-8 with Carrillo rods, ARP main and head studs, SoCal Diesel camshaft, SoCal Diesel valvesprings, Mahle 16.5:1 cast-aluminum pistons
FUEL: 100-percent-over Exergy Engineering injectors, PPE Dual Fueler AirDog 150-gph fuel system
AIR: S475/83/1.10 turbo, ZEX single-stage nitrous system
TRANSMISSION: Inglewood Transmission Allison 1000 with Goerend 3,000-rpm stall torque converter
HORSEPOWER: 785 hp on fuel, 814 hp on nitrous
TORQUE: 1,400 lb-ft (est.)
TIRES: 305/50/20 Yokahama Parada
WHEELS: 20x8.5-inch American Eagle
SUSPENSION: DJM 3-inch drop, lower control arms (front), DJM drop shackles, two leafs, and CalTracs traction bars (rear)
FUN FACT: Anthony says his diesel is a near dead-even race with his dad’s modified ZO6 Corvette!
Photo 15/15   |   2008 GMC Sierra 2500HD License Plate

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