2007 gmc sierra 1500 review this car review is specific to this model, not the actual vehicle for sale. The sierra 1500 classic is the older 2006 model full-size truck carried over into 2007 and renamed 'classic' to distinguish it from the fully redesigned sierra. The 1500 classic is a half-ton full-size truck. As a regular cab model it can seat up to three passengers. Extended cab models can carry up to six passengers. Engine choices for the 1500 classic include: 195 hp 4. 3-liter v-6, a 285 hp 4. 8-liter v-8 and a 295 hp 5. 3-liter v-8. The 5. 3-liter v-8 can be equipped to run e85 fuel and an aluminum variant of the 5. 3-liter v-8 can make 310 hp. The denali luxury trim comes with a more powerful 345 hp 6. 0-liter v-8. The gmc sierra 1500 classic is a carryover from 2006.