General Motors expects new heavy-duty versions of its Chevrolet Silverado and GMC Sierra trucks to push it past Ford Motor Co. in the pickup market. The 2001 Silverado HD, right, and Sierra HD, above, will hit dealer showrooms in August and are forecast to increase GM sales of three-quarter-ton and one-ton pickups past 250,000 units in 2001, up from about 180,000 in 1999. Those figures also include light-duty three-quarter-ton pickups, which are below 8,500 pounds gross vehicle weight. The HD trucks are GM's answer to Ford's SuperDuty F-series trucks, introduced in 1998. Engines for the new HD trucks include a new 6.6-liter Duramax diesel that produces 520 pounds-feet of torque, and a new 8.1-liter V-8 Vortec gasoline engine that produces 455 pounds-feet of torque.
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