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Product Information

Product Details
Part No. AR3911
Warranty Details (2 YR REPLACEMENT IF DEFECTIVE)
Autolite Racing spark plugs are precision-engineered to elevate your engine's performance on the track. Featuring a cut-back ground electrode, these plugs ensure optimal ignitability and superior heat transfer for quicker starts and consistent power delivery. The yttrium-enhanced alloy reduces ground wire temperature by up to 8%, making them ideal for colder heat ranges and performance modifications under intense racing conditions. Built with anti-corrosive nickel plating, they resist rust better than black oxide, ensuring long-lasting durability and efficiency. The high alumina multi-rib ceramic insulator provides exceptional thermal conductivity and insulation, preventing flash-over while enhancing strength. Designed with a flat gasket seat type, these spark plugs deliver optimal performance in aftermarket cylinder heads commonly used in oval and road racing. With a durable design tailored for extreme stress, Autolite Racing spark plugs are the ultimate choice for racers seeking reliability and peak performance.

Product Features:
  • Engineered with a cut-back ground electrode that delivers optimal ignitability of the flame kernel and better heat transfer, leading to quicker starts.
  • The yttrium-enhanced alloy enables up to 8% reduction in ground wire temperature for colder heat ranges designed to enable performance modifications and handle intense conditions.
  • Designed with an anti-corrosive nickel-plating prevents rusting better than black oxide, allowing the plug to maintain its durability and efficiency.
  • Its high alumina multi-rib ceramic insulator provides thermal conductivity and superior insulation for increased strength while preventing flash-over.
  • Optimal Performance: Features a gasket seat type for optimal performance in aftermarket cylinder heads used in oval and road racing.
  • Durable Design: Specifically designed to handle intense racing conditions, ensuring reliable performance under extreme stress.
Specifications
Center Electrode Core Material:
Copper

Center Electrode Design:
Standard

Center Electrode Projection:
Mid Projection

Center Electrode Tip Material:
Nickel

Electrical Terminal Type:
Non-Removable Nut

Electrode Tip Material:
Non Resistor

Grade Type:
Performance

Ground Electrode Core Material:
Nickel

Ground Electrode Quantity:
1

Ground Electrode Tip Design:
Standard

Ground Electrode Tip Material:
Nickel

Hex Size:
5/8 in

Hex Type:
Hex

Indexed:
No

Insulator Material:
Ceramic

Manufacturer Heat Range:
12

Pre-Gap Size:
0.025 in

Reach:
0.75 in

Resistor:
Non Resistor

Resistor Type:
No

Seat Type:
Flat

Skirt:
Yes

Thread Diameter:
14 mm

Tip Configuration:
Power

Washer(s) Included:
Yes

Wrench Diameter:
5/8 in
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