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.
About 290 hp.
300 hp
315 hp 345 torque
great truck with 290hp and 410tq at 3200 rpms
I believe it is 260 horsepower.
It depends on the year of the vortec. From what I see the 05 is pushing 285hp
The horsepower of a GMC Sierra is 355 hp.
vortec 454,1996 thru 1999-->>>290HP 410TQ
NO. That would be the TBI / throttle body injection engine Not a vortec. The vortec will not work in the 91.
The 2001 model of the Light-Duty Silverado 1500, had an option of four engine sizes; a 6.0L Vortec V8 engine, a 4.3L Vortec V6, a 4.8L Vortec V8 or a 5.3L Vortec V8. The Heavy-Duty 1500HD comes with three engine options, these are 6.0L Vortec V8, 8.1L Vortec V8 and a 6.6L Duramax V8
Vortec 6.0L
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.