How much horsepower does a 4.3 Chevy Blazer have?
The typical 4.3-liter Blazer runs around 190 horsepower, though the exact figure depends on the year and which 4.3-liter family is installed.
Across its production, the Blazer used two main 4.3-liter families: an older, pre-Vortec design and the later Vortec 4300. Each family has its own horsepower profile, influenced by emissions controls, injection technology, and calibration. Here’s a concise, up-to-date snapshot to help you estimate what a given model year might have produced.
Power profiles by engine family
Below is a quick guide to typical horsepower figures for the two main 4.3L families used in Chevy Blazers. These are approximate values reflecting common configurations and may vary by year, market, and options.
Pre-Vortec 4.3L V6 and the Vortec transition
- Pre-Vortec 4.3L V6 (older Blazers, late 1980s to mid-1990s): typically around 165–180 horsepower, depending on fuel system and emissions equipment.
- Vortec 4300 4.3L V6 (late-1990s onward): commonly rated at about 190 horsepower, with torque often in the 250–285 lb-ft range depending on year and calibration.
For the exact rating on a specific vehicle, consult the door sticker or VIN-referenced build data, as horsepower can vary with emissions and inspection requirements.
What this means for drivers
With roughly 190 hp in the most common configuration, the Blazer provides solid midrange performance and adequate towing ability for its class. Older, non-Vortec engines will generally offer lower output, closer to the mid-160s to 180s horsepower.
Summary: The 4.3-liter V6 in the Chevy Blazer has most commonly delivered about 190 horsepower in its Vortec 4300 form. Earlier, non-Vortec variants were typically in the 165–180 horsepower range. For the exact figure on a specific truck, check the door sticker or VIN documentation.
