NGK 51249 Spark Plug Wire Set

NGK Spark Plug Wire Set for GM V6 Applications

The NGK Spark Plug Wire Set, part number 51249, is a specific-fit ignition wire set built for select Chevrolet and GMC vehicles from 1986-1991. It uses blue silicone insulation, noise suppression, and an SMag core to support stable spark delivery in older GM ignition systems.

Key Features

• Specific-fit NGK Spark Plug Wire Set for confirmed GM applications
• Blue silicone insulation for heat resistance and durability
• Noise suppression type construction to help reduce ignition interference
• SMag core material for consistent electrical performance
• Insulation outside diameter: 8.00 mm
• NGK part number 51249 / RC-GMZ038

Product Details

NGK Spark Plug Wire Set 51249 is part of NGK’s ignition product line, which includes spark plugs, glow plugs, ignition coils, coil-on-plug boots, and wire sets. NGK draws on long-term OE experience and global manufacturing standards to supply replacement ignition components for domestic and import vehicles. This wire set is built for direct application coverage on vehicles such as the Chevrolet Astro, Chevrolet C1500, GMC Safari, and related GM truck and van platforms listed in the fitment data.

This part cross-references DENSO Auto Parts (e.g., 671-6003) for the same application.

What It Helps Address

• Misfires caused by worn or damaged spark plug wires
• Hard starting related to weak or inconsistent spark transfer
• Ignition noise that can interfere with vehicle electronics
• Rough idle from deteriorated wire insulation or core wear
• Voltage leakage in aging Chevrolet and GMC ignition systems

Installation Notes and Tips

Verify engine-specific routing before installation and transfer wires one at a time to preserve firing order. Inspect plugs, distributor cap, and coil terminals for wear before installing the new set. Confirm fitment against the vehicle’s year, make, and model, including applications such as 1986-1991 Chevrolet Astro, 1988-1991 Chevrolet C1500, 1987-1991 GMC Safari, and other listed GM platforms.

Quality Assurance

NGK is known for OE-focused ignition manufacturing and global product coverage. Part number 51249 is produced to meet durability and operational performance expectations for replacement ignition service.