NGK 3971 Spark Plug - Exhaust Side

NGK Laser Platinum Spark Plug Overview

The NGK Laser Platinum Spark Plug 3971 is engineered for reliable ignition performance in a variety of vehicles including Chevrolet, Honda, Toyota, and Nissan models. Designed with precision materials and specifications, this spark plug supports efficient combustion and consistent engine operation.

• Part Number: 3971 (Bpr5ep-11)
• Center Electrode Tip Material: Platinum for enhanced durability
• Center Electrode Core Material: Copper for optimal conductivity
• Ground Electrode Core Material: Nickel with standard tip design
• Resistance: 5000 ohms to reduce electrical noise
• Pre-Gap Size: 0.044 inches for precise spark delivery
• Thread Diameter: 14.00 mm with 0.75 inch reach
• Hex Size: 13/16 inch for standard installation tools
• Electrical Terminal Type: Non-removable nut
• Seat Type: Flat for secure fitment
• Manufacturer Heat Range: 5

About the NGK Laser Platinum Spark Plug Line

The Laser Platinum Spark Plug line from NGK combines platinum-tipped electrodes with copper cores to provide a balance of durability and efficient electrical conductivity. This design helps maintain stable ignition performance over extended service intervals, making it suitable for a wide range of secondary ignition applications. The 3971 model benefits from this technology, offering consistent spark and resistance to electrode wear.

Detailed Product Description

The NGK 3971 spark plug features a platinum center electrode tip that enhances wear resistance and longevity compared to conventional plugs. The copper core center electrode improves thermal conductivity, helping to dissipate heat effectively. The single nickel ground electrode with a standard tip design ensures reliable spark gap maintenance. With a resistance rating of 5000 ohms, this spark plug minimizes electromagnetic interference, protecting sensitive vehicle electronics. Its flat seat and 14 mm thread diameter with a 0.75 inch reach make it compatible with many popular models from Chevrolet, Chrysler, Dodge, Honda, Isuzu, Kia, Mazda, Mitsubishi, Nissan, Plymouth, and Toyota.

Compatible Vehicles and Common Applications

• Chevrolet Nova, Pickup, and Camaro models
• Honda Accord and Prelude
• Toyota Camry, Corolla, Celica, and Land Cruiser
• Nissan 280ZX, Pulsar, and Sentra
• Dodge Daytona and Grand Caravan

Installation Notes and Tips

• Ensure the spark plug gap is set to 0.044 inches before installation if not pre-gapped
• Use a 13/16 inch socket wrench for proper torque application
• Apply anti-seize compound sparingly on threads to prevent galling
• Verify flat seat compatibility with your engine cylinder head
• Follow manufacturer torque specifications to avoid damage

Quality Assurance and Warranty

NGK spark plugs, including the Laser Platinum Spark Plug 3971, are manufactured to meet strict quality standards. The use of premium materials such as platinum and copper ensures durability and consistent performance. While specific warranty details may vary, NGK products typically come with manufacturer-backed quality assurance to support reliable ignition system operation.