The 4.3 vortec engine generates 190 hp with 253 pound-feet of torque running on gasoline. Using propane, it generates 183 hp with 247 pound-feet of torque. If the fuel used is natural gas, it induces 164 hp with 230 pound-feet of torque.
The 8.1L vortec comes stock with 330 hp and about 450 pound feet of torque.
285 hp 335 torque
290 HP
175 hp 205 ft lbs of torque
315 hp 345 torque
255 hp 350 f/lbs torque at 2800 rpms that's stock no mods
The Factory5.7(350) V8 Vortec was rated at 255 net hp @4600rpm and 330 net torque @2800rpm
397 hp
a 350 will produce around 250 hp, and a 305 about 200 hp
50
The horsepower of a GMC Sierra is 355 hp.
It has 275 hp.