Usually you can find out the information about the engine from the Chevrolet website, or some other website. Since Chevy no longer puts 350's in their trucks I am not sure if there would be information on their website. I do believe that the stock horsepower on that particular motor is 255.
I believe it is 260 horsepower.
Every vehicle has a different type of horsepower depending on the specifications of the vehicle. The 1999 Tahoe Z71 350 Vortec Engine has a horsepower of 255 at 4600 RPMs.
It has 255 horsepower bone stock
245 hp.
I own a 93 Chevy Silverado K1500 4x4 with V8 350 TBI 5.7L. so unless Chevy has changed their blocks, i would suggest that naturally your block is a SB 350. However, since your question was about horsepower, not which block you have, I will tell you the horsepower. The 1998 Vortec 5.7 liter makes 255 horsepower.
255 HP from the factory.
The difference in horsepower between stock heads and Vortec heads on a 350 Chevy can vary, but typically, upgrading to Vortec heads can yield an increase of around 30 to 50 horsepower. Vortec heads are designed for better airflow and combustion efficiency, which contributes to this gain. The actual increase can depend on the overall engine setup and tuning.
250-290 hp
Try a search for vortec engines
in 95 they went to the vortec engine but a 94 (like mine) had 200hp and 300 ft/lbs torque from the factory
Probably about 240 or close. Move to a 96 and it's a lot more. The Vortec started in 96 with the 350 (5.7) and 454 (7.4). I understand the Vortec 5.7 had a little more power than the non-Vortec 7.4, and the Vortec 5.7 has 250 horsepower.
Free flowing exhaust, nitrous