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.
255 HP from the factory.
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.
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
255 hp 350 f/lbs torque at 2800 rpms that's stock no mods