GMC Sierra 1500 Denali full-size pickup Brand GM 2014 GMC Sierra 1500 Denali full-size pickup will be available this fall with an 6.2L EcoTec3 V-8 engine, which will produce 420 horsepower and 450 lb-ft of torque. The GMC Sierra Denali is the most deluxe and technologically modern GMC half-... By spare-wheel, 31 May, 2013