NGK 3547 Spark Plug

NGK G-Power Spark Plug 3547 Overview

NGK G-Power Spark Plug 3547 is an OE-style replacement spark plug built for steady ignition performance in a wide range of domestic applications. With a platinum center electrode tip, copper core center electrode, and nickel ground electrode, it supports consistent spark delivery for older Chevrolet, Ford, and GMC engines that call for this style of plug.

The G-Power line is NGK’s OE-focused spark plug family, combining original-equipment standards with durable materials and application-specific fitment. This UR5GP plug is a tapered-seat design with a 0.040 pre-gap, 14 mm thread diameter, 0.46 reach, and 5 k? resistance.

Key Features

• NGK G-Power Spark Plug, part number 3547
• Platinum center electrode tip for stable ignition performance
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with standard configuration
• 0.040 pre-gap, 14 mm thread diameter, 0.46 reach
• Tapered seat design with non-removable nut terminal
• OE-style replacement for many Chevrolet, Ford, GMC, Pontiac, Buick, Cadillac, Jeep, and Isuzu applications

Detailed Description

NGK 3547 is engineered for drivers and technicians looking for a direct-replacement spark plug that matches OE-style dimensions and service expectations. The platinum tip helps maintain consistent firing characteristics, while the copper core supports heat dissipation for dependable operation. This makes it a practical choice for older trucks, vans, SUVs, and passenger cars that use a tapered-seat 14 mm spark plug with a 0.46 reach.

Compatible With applications such as 1997 Ford F-250 HD, 1997 Ford F-350, and 1994-1995 Chevrolet C1500, this plug also appears across many Chevrolet G30, GMC K1500, and Pontiac Firebird fitments. The NGK G-Power Spark Plug 3547 is a strong match when you need OE-equivalent dimensions and a plug built around proven ignition materials.

This part cross-references Anchor 3018 and NGK 4302 for the same application.

What It Helps Address

• Hard starting caused by worn or inconsistent spark plugs
• Rough idle from weak ignition output
• Misfire conditions related to plug wear or incorrect gap
• Reduced throttle response from degraded spark delivery
• Service replacement needs on high-mileage OE-style ignition systems

Installation Notes and Tips

• Verify engine application, thread diameter, reach, and seat type before installation.
• Check the required gap for your vehicle; listed fitments include both 0.035-inch and 0.044-inch/0.045-inch specifications depending on application.
• Use the vehicle service manual for final gap and torque specifications.
• Inspect ignition wires, coils, and distributor components during spark plug service.
• Confirm the correct plug heat range for the engine before installation.

Quality Assurance

NGK is a major OE supplier and manufacturer with more than 80 years of automotive experience. Its spark plugs are produced to support original-equipment standards for durability and operational performance across domestic and import vehicle applications.

Fits 1997 Ford F-250 HD, 1997 Ford F-350, 1994-1995 Chevrolet C1500, and many additional Chevrolet, Ford, GMC, Pontiac, Buick, Cadillac, Jeep, and Isuzu models listed in the fitment data.

Fits 1987-1997 Chevrolet P30 and 1987-1997 GMC P3500, plus other long-running truck and van applications in the fitment list.

Fits 1994-1995 Pontiac Firebird and 1994-1995 GMC Yukon where the listed plug specifications match the engine requirements.