Denso 6021 Spark Plug

Reliable Ignition Performance for Classic GM and Chrysler Vehicles

The Denso 6021 spark plug from the U-Groove Conventional line is engineered to deliver consistent ignition performance for a range of Buick, Cadillac, Chevrolet, Chrysler, Dodge, Oldsmobile, and Pontiac models. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• U-groove ground electrode tip design for improved spark exposure
• Nickel ground electrode core and center electrode tip for durability
• Copper center electrode core for optimal conductivity
• Standard ground configuration with a single ground electrode
• Flat seat type with 14.00 mm thread diameter and 9.50 mm reach
• Pre-gap size of 0.7 mm for precise ignition timing
• Hex size of 20.6 mm for easy installation
• Manufacturer heat range rating of 14 suitable for various engine conditions

About the Denso U-Groove Conventional Spark Plug Line

The U-Groove Conventional series by Denso features spark plugs with a unique U-groove ground electrode tip design. This design enhances spark exposure to the air-fuel mixture, promoting more efficient combustion. The conventional construction balances durability and performance, making it suitable for a wide range of secondary ignition applications in classic and modern vehicles.

Technical Details and Compatibility

The Denso 6021 spark plug incorporates a nickel ground electrode core and tip, paired with a copper center electrode core, combining durability with excellent electrical conductivity. The flat seat and 14.00 mm thread diameter ensure proper fitment in compatible engines. With a pre-gap size of 0.7 mm and a heat range of 14, this spark plug is designed to maintain stable ignition under various operating conditions.

Compatible Vehicles and Applications

• Buick models including Century, LeSabre, and Skylark
• Cadillac DeVille, Eldorado, and Fleetwood
• Chevrolet Camaro, Caprice, Impala, and Corvette
• Chrysler Town & Country and Imperial
• Dodge Magnum and other compatible models
• Oldsmobile Cutlass, Delta 88, and 98
• Pontiac Firebird, GTO, and Bonneville

Common Issues Addressed by Denso 6021 Spark Plug

• Misfiring or rough engine idle
• Reduced fuel efficiency due to incomplete combustion
• Difficulty starting the engine in cold conditions
• Engine hesitation or loss of power under load
• Excessive spark plug fouling or wear

Installation Notes and Tips

Ensure the engine is cool before removing old spark plugs. Use a torque wrench to tighten the Denso 6021 spark plug to manufacturer specifications to avoid damage. Verify the pre-gap size of 0.7 mm before installation, adjusting if necessary. The 20.6 mm hex size allows for standard spark plug socket compatibility. Inspect the spark plug threads and seat for cleanliness to ensure proper sealing.

Quality Assurance and Warranty

Denso spark plugs, including the 6021 part number, are manufactured to meet strict quality standards for secondary ignition components. The use of nickel and copper materials ensures durability and consistent performance. While specific warranty details may vary, Denso products typically come with manufacturer-backed quality assurance to support reliable operation in compatible Buick, Cadillac, Chevrolet, Chrysler, Dodge, Oldsmobile, and Pontiac vehicles.