NGK V-Power UR4 Spark Plugs 8-Pack — Shorty Resistor, Heat Range 4 for 1988–1991 Chevrolet Corvette 5.7L/350

NGK V-Power UR4 spark plugs (8-pack) are replacement shorty resistor plugs designed to fit 1988–1991 Chevrolet Corvette 5.7L/350 engines, offering reliable ignition performance for V8 small-block Chevy applications.

If you need a direct-fit spark plug for a Gen I Chevy small-block 5.7L/350 used in late‑80s and early‑90s Corvettes, NGK’s V-Power UR4 delivers a balance of dependable spark and value. These are sold as an eight-pack and are configured as shorty plugs with an integrated resistor and a manufacturer heat range of 4, engineered for standard ignition systems found in that era of Chevrolet performance engines.

Will these plugs fit my 1988–1991 Corvette 5.7L/350?

Yes — the UR4 specification matches the factory-type short reach and resistor requirements for Chevy small-block Gen I 5.7L engines from those model years. They are made to be a like-for-like replacement without modification.

• Application: Chevrolet Corvette 1988–1991, 5.7L/350 V8
• Engine family: Chevy small block Gen I compatibility
• Physical type: shorty spark plug with resistor
• Sold quantity: eight plugs per pack for complete V8 coverage

How do NGK V-Power UR4 plugs affect everyday driving?

These plugs deliver stable ignition under normal driving and light performance conditions, helping maintain consistent starts and throttle response. They are positioned as economical replacements that retain expected engine behavior for street-driven Corvettes.

• Consistent spark for smooth idle and steady throttle
• Resistor design reduces radio interference and electrical noise
• Heat range 4 tuned to common small‑block operating temperatures

What are the key specs and installation considerations?

UR4 plugs are short-reach designs, so thread engagement and seat type match factory expectations; torque to manufacturer specifications during installation. Use an appropriate socket and anti-seize only if recommended by engine builder; verify gap if your application requires a non-standard setting.

• Manufacturer heat range: 4
• Shorty spark plug length (short reach)
• Pre‑set/gapped for typical factory ignition, check before fitting if modified
• Sold in an eight‑piece set to replace all cylinders on V8 engines

How long can I expect these plugs to last?

Service life depends on driving conditions, ignition system health, and fuel quality; under normal street use they typically provide reliable service for thousands of miles. Inspect plugs during routine tune-ups and replace sooner if signs of fouling or wear appear.

• Durability influenced by driving style and engine condition
• Inspect at regular maintenance intervals for fouling or gap erosion
• Replace the set to preserve consistent firing across all cylinders

Who is this for: This NGK V-Power UR4 8-pack is intended for owners, restorers, and DIY mechanics working on 1988–1991 Chevrolet Corvette models equipped with the 5.7L/350 V8 (Chevy small block Gen I). It suits drivers wanting a cost-effective, OEM-style replacement plug set that maintains factory fit and function for street-driven cars and light performance use.