The 1998 5.7L Vortec V8 delivers 255 horsepower (190 kW) in standard form, along with about 330 lb-ft of torque.
This article explains the official rating for the 1998 5.7L Vortec, where that figure comes from, and what variations can occur in real-world use across GM's late-1990s trucks and vans.
Core specifications
Here are the core specs that define the engine's output for the 1998 model year.
- Displacement: 5.7 liters (350 cubic inches) V8
- Horsepower: 255 hp (190 kW) at 4,000 rpm
- Torque: 330 lb-ft (447 Nm) at 2,800 rpm
- Engine family: GM Vortec 350 small-block
- Applications: Used in various light-duty GM trucks and SUVs of the era
These figures reflect the official rating for the 1998 5.7L Vortec in typical production configurations. Real-world numbers can vary slightly due to wear, altitude, exhaust setup, and tuning.
Variations and caveats
While 255 hp is the commonly cited figure for the 1998 L31 Vortec 350, some vehicles may exhibit minor differences in output due to emissions calibration, market specifications, or vehicle condition.
Context for buyers and restorers
When evaluating a 1998 Vortec-equipped GM pickup or SUV, horsepower is just one part of the performance picture. Torque, gearing, transmission, and overall vehicle weight all influence actual acceleration and towing capability.
Summary
The 1998 5.7 L Vortec V8 is rated at 255 horsepower and 330 lb-ft of torque, making it a robust, mid-size V8 option for GM’s late-1990s trucks and SUVs. For enthusiasts and owners, these figures provide a reference point for performance expectations and restoration accuracy.