Interest and sales in the new 2014 Chevrolet Silverado and GMC Sierra 1500 have been strong, and dealers are asking for as many of the bread-and butter 5.3-liter V-8 models as possible. Unlike Ford, which sells a majority of its F-150 models with V-6 engines, the 5.3 V-8 has long represented the bulk of sales for the Silverado and Sierra, as much as 80 percent of volume. Due to a supplier constraint, dealer shipments of the 5.3-liter models are being pulled back slightly, according to Bloomberg.

Dealers that order 10 5.3-liter Silverados will receive eight V-8s for the time being and two V-6 models. GM just debuted its new topline 6.2-liter engine for the 1500 models, a $1995 option on the Silverado and Sierra, but that engine is not expected to be in showrooms until late in the fourth quarter of 2013.

The 4.3-liter EcoTec V-6 offered standard in the 2014 Silverado in Sierra is a major improvement over last year's dated base V-6, with 90 more horsepower and 45 lb-ft more torque than its predecessor, and offering similar horsepower output to the earlier generation of the port-injected 5.3-liter V-8, as well as a competitive 24 mpg EPA highway rating.

Source: Bloomberg