How much HP does a V-6 4.3 Vortec make in a 99 S10 Extreme?
The engine in question—the 4.3L Vortec V6 used in the 1999 S-10 Extreme—produces about 190 horsepower, with roughly 260 lb-ft of torque in stock form. Actual numbers can vary slightly by vehicle condition and emissions configuration.
Overview of the 4.3L Vortec in the 1999 S-10 Extreme
The 4.3L Vortec 4300 is GM’s widely used small‑block V6 for S-series trucks, including the S-10. In the late 1990s, GM rated this engine at SAE net horsepower in the vicinity of 190 hp, with torque around 260 lb-ft. The S-10 Extreme, a sport-oriented trim, did not change the engine’s fundamental output; it primarily altered styling, suspension, and interior features. Because horsepower ratings can differ by test standards (net vs. gross) and production variations, you may see numbers that are very close but not identical across sources.
Key horsepower figures for the 1999 S-10 Extreme
To pin down the commonly cited stock output, consider these official figures often associated with the 4.3L Vortec in this era:
- Horsepower (SAE net): 190 hp
- Torque (SAE net): 260 lb-ft
These numbers reflect the SAE net rating used for 1999 GM trucks, which accounts for standard equipment and operating accessories. They do not account for aftermarket modifications or wear that affects performance.
Caveats and context
Horsepower can vary by year, emission standards, and whether a vehicle has been modified. Some older literature may reference higher gross figures or rounding differences; modern GM documentation for the late 1990s S-series consistently lists around 190 hp and 260 lb-ft of torque for the 4.3L Vortec in stock condition. Environmental and drivetrain differences can also influence actual on-road performance compared with the published numbers.
Summary
How much horsepower does a Chevy S10 Xtreme have?
The Chevrolet S10 Xtreme typically has about 190 horsepower, thanks to its standard 4.3-liter V6 engine. However, some models were available with a less powerful 2.2-liter, 4-cylinder engine that produced around 120 horsepower. The V6 was optional on standard S10s, but the Xtreme package was designed for the sporty look and came with a performance-oriented suspension, so most Xtreme models feature the more powerful engine.
You can watch this video to learn more about the S10 Xtreme's engine and performance: 56sSaabkyle04YouTube · Mar 22, 2012
- 4.3L V6 engine: Most S10 Xtreme models came with this engine, producing approximately 190 horsepower. It also has about 250 pound-feet of torque.
- 2.2L 4-cylinder engine: Some S10 Xtreme models were equipped with a 2.2-liter engine, which produced about 120 horsepower.
- Engine availability: The 4.3L V6 was an option on standard S10s and became the standard engine for the Xtreme package.
How much horsepower does a 4.3 V-6 S10 have?
The Chevrolet S10's 4.3L V6 engine typically produced between 180 and 200 horsepower, depending on the model year and configuration. Early models and some 2WD versions might produce around 180-190 hp, while four-wheel-drive or specific S-10 SS models could reach up to 200 hp.
- 180 hp: This was a common rating for 2WD models and many years of production, with torque around 245 lb-ft.
- 190 hp: Some models, particularly four-wheel-drive S10s or Blazer versions, produced 190 hp and 250 lb-ft of torque.
- 200 hp: This higher output was sometimes found in certain models, especially the S-10 SS or the larger Silverado 1500.
What made the S10 Xtreme special?
But the Xtreme got a lot of upgrades that Chevrolet figured would attract younger buyers. Those upgrades included an aggressive body kit, model-specific 16-inch wheels, and ZQ8 suspension, which notably lowered the ride height.
How much horsepower does a 1999 Chevy S10 4.3 have?
It produces 120 horsepower at 5,000 rpm and 140 pound-feet of torque at 3,600 rpm. The optional engine is 4.3-liter V-6 that produces 180 horsepower (190 horsepower in four-wheel-drive models) at 4,400 rpm and 245 pound-feet of torque (250 pound-feet in 4x4s) at 2,800 rpm.
