The 1998 Chevrolet Blazer offered two gasoline engine options: a 4.3-liter V6 and a 5.7-liter V8. Both were gasoline-powered, with no diesel option in the U.S. market for that year.
In the context of that model year, the Blazer sat on GM’s GMT400 platform, and engine availability varied by trim level, drivetrain configuration (2WD vs. 4WD), and regional market. This piece breaks down the two main engines you’d typically encounter in a 1998 Blazer and how to tell which one a particular vehicle has.
Engine options for the 1998 Blazer
Below are the two primary engine configurations that were offered for the 1998 Blazer, including their core characteristics and typical performance benchmarks.
4.3-liter V6
The base and most common powerplant for the 1998 Blazer was a 4.3-liter V6, a long-running GM small-block design adapted for trucks. It is a gasoline engine with a V6 configuration and a focus on reliable, everyday performance rather than high-end power.
- Displacement: 4.3 L (262 cu in)
- Configuration: V6
- Power: typically around 190–200 horsepower, depending on revision and emissions equipment
- Torque: generally in the neighborhood of 260–275 lb-ft
- Drivetrain compatibility: commonly paired with 2WD or 4WD transmissions of the era
In practice, the 4.3-liter engine offered a balance of everyday usability and efficiency, making it the most common choice for Blazer buyers seeking fuel economy and adequate towing capability.
5.7-liter V8
The optional engine for more power was a 5.7-liter V8, a traditional small-block Chevrolet V8 that delivered stronger acceleration and towing ability compared with the V6.
- Displacement: 5.7 L (350 cu in)
- Configuration: V8
- Power: typically around 255 horsepower
- Torque: commonly about 330 lb-ft
- Drivetrain compatibility: often found with automatic transmissions and available in 4WD configurations
The 5.7-liter V8 offered notably higher peak torque, which helped with payload and trailer work, but came with increased fuel consumption compared with the 4.3-liter option.
How to tell which engine yours has
Determining the exact engine in a 1998 Blazer is practical for maintenance, parts lookup, and resale considerations. Here are reliable ways to identify the engine without pulling the engine apart.
Check the under-hood markings and labeling. The engine itself will often have a stamped or embossed designation on the intake manifold or valve cover indicating “4.3L” or “5.7L.”
Review the VIN and window sticker. The 8th character of the VIN (in many GM configurations) or the vehicle’s original build sheet can point to the engine family, and the window sticker will list the engine option if you have access to it.
Look for badge or emblem clues. Some Blazer models display an “4.3L” or “350” badge on the front fenders or rear, and the hood or engine cover may carry a similar marking.
If in doubt, a quick garage check can confirm. A trusted mechanic can verify the engine by cross-referencing the vehicle’s VIN with GM’s factory engine codes or by a simple service bay inspection of the valve covers and intake spelling out the displacement.
Summary
For the 1998 Chevrolet Blazer, the engine lineup consisted of two gasoline options: a 4.3-liter V6 and a 5.7-liter V8. The V6 offered dependable everyday performance, while the V8 provided extra power for towing and quicker acceleration. Engine identification can be confirmed via markings on the engine, VIN details, or the original window sticker, ensuring you know exactly which powerplant sits under the hood.
Notes for readers
Engine availability could vary by trim level and market. If you’re researching a specific vehicle, consult the owner’s manual, build sheet, or a dealership database to confirm the exact engine configuration for that particular Blazer.
What year Blazer to stay away from?
If we were going to pick one year to avoid, it would be 2019, which had two recalls and 111 consumer complaints via the NHTSA—and 2020 was a close second. For the classic Blazer, the 2000 model year logged 626 complaints and had four recalls.
What common problems did the 1998 Blazer have?
Top 1998 Chevrolet Blazer Problems
- Air Compressor for Rear Air Springs May Fail.
- AC Blower Inop Due to Failed Resistor.
- Fuel Level Sensor Failure.
- GMC Envoy engine stalls when A/C or defrost is activated.
- Cooling Fan Clutch May Fail Causing Noise and Check Engine Light.
- Check Engine Light Due to Gas Cap Issue.
Is the 1998 454 a good engine?
dont expect many miles per gallon from a 454, but it is a good engine and it offers the best economy for normal diving conditions. 1998 is a Chevy P32 chassis, NOT a Workhorse chassis. Good engine and transmission. 290 HP, port injected.
How much horsepower does a 1998 5.7 Vortec engine have?
255 horsepower
The Chevy 5.7L V8 Vortec 5700 L31 engine (1996-2000) delivers power, reliability, and performance for Chevrolet and GMC trucks, SUVs, and vans. With 255 horsepower and 330 lb-ft of torque, this cast iron block engine provides impressive towing capacity and smooth acceleration.