Looks like GM released some specs on the 2014 1500 trucks.
http://news.pickuptrucks.com/2013/04/2014-silveradosierra-release-53l-mpg-power-payload-and-towing-numbers.html
V8 5.3l direct injected, normally aspirated, EcoTec making 355 HP / 383 LB.FT. burning 87 octane with no turbos or...