Best Ground Electrode Spark Plug

Autolite AR3932-4PK High Performance Racing Non-Resistor Spark Plug, 4 Pack

Replacement racing spark plug used by many professional car drivers.
Specifically designed with colder heat ranges than the factory plug to enable performance modifications and handle intense conditions.
Contains an Yttrium-enhanced alloy to enable up to 8% reduction in side wire temperature for improved durability and less pre-ignition.
Features cut back ground electrode for improved ignitability of flame kernel.
Coated in an anti-corrosive nickel plating to prevent rusting.

0.4 mm iridium center electrode: world's smallest diameter that maximizes firing potential.
U-groove and taper cut ground electrode: provides faster spark flame growth and lessens heat quenching.
DENSO patented 360 degree laser welding process: ensuring exceptional quality bond and structural strength with the iridium center electrode.

0.4 mm iridium center electrode: world's smallest diameter that maximizes firing potential.
U-groove and taper cut ground electrode: provides faster spark flame growth and lessens heat quenching.
DENSO patented 360 degree laser welding process: ensuring exceptional quality bond and structural strength with the iridium center electrode.

0.4 mm iridium center electrode: world's smallest diameter that maximizes firing potential.
U-groove and taper cut ground electrode: provides faster spark flame growth and lessens heat quenching.
DENSO patented 360 degree laser welding process: ensuring exceptional quality bond and structural strength with the iridium center electrode.

Built to ISO and SAE standards for proven performance.
Copper core center electrode allows for accurate control of heat range for longer life.
TinTac and ULTRASEAL shell for best corrosion protection of any spark plug in the industry.
Patented SAC-9 semi-conductor resistor for maximum EMI & RFI suppression.
TinTac and ULTRASEAL shell for best corrosion protection of any spark plug in the industry..

One-piece, fired-in suppressor seal blends three glass types for a gas-tight seal that helps reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures for long life.
Double platinum point pad on center and ground electrode offer excellent durability and consistent voltage demands to help reduce wear on ignition system.
Pure copper core results in cooler electrode temperature for maximized durability and fouling resistance.
Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.
ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors.
GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle.
GM regularly updates production and service part designs to integrate new materials and technologies.

Tapered, v-profile nickel chromium ground electrode for improved cold starts and fuel ignitability.
Heavy-duty, yttrium enhanced copper core center electrode for reliability and performance.
Bosch Copper with Nickel spark plugs feature a heavy-duty yttrium-enhanced copper core center electrode for improved durability.

Tapered, v-profile nickel chromium ground electrode for improved cold starts and fuel ignitability.
Heavy-duty, yttrium enhanced copper core center electrode for reliability and performance.
Bosch Copper with Nickel spark plugs feature a heavy-duty yttrium-enhanced copper core center electrode for improved durability.

Tapered-cut ground electrode improves ignitability and reduces quenching.
98% pure copper core increases heat dissipation for more reliable starts and prevents spark plug from overheating.
High-grade alumina silicate ceramic insulator for superior strength and heat transfer.
Iridium is six times more durable than platinum.
Quantity: 1 per package. Triple seals prevent leakage.

Double platinum point pad on center and ground electrode offer excellent durability and consistent voltage demands to help reduce wear on ignition system.
The same performance as your GM vehicle's original factory component.
Spark plug distributor boot shape and materials provide proper fit, installation, and water-tight seal.
Pure copper core results in cooler electrode temperature for maximized durability and fouling resistance.