PART NUMBER: 37164
BRAND: Holley

Iridium Spark Plug

Product Details

• Brand: Holley
• Part Number: 37164
• Clearance Category: Ignition
• Heat Range: 6
• Hex Size: 9/16
• Length: Standard
• Plug Style Code: 31R6
• Product Type: Spark Plug
• Projected Tip: No
• Quantity: 4
• Reach: 0.8125
• Resistor: Yes
• Seat Type: Tapered
• Style: Iridium
• Thread Size: 16mm

Holley Iridium Spark Plug

Product Features

• Proprietary plug design inside and out
• Designed for use on high performance vehicles that utilize high output ignition systems
• Machined electrode increases exposure to the flame to improve combustion
• MSD’s proprietary ceramic formula provides the highest dielectric strength
• Yttrium ground electrode reduces the chance of pre-ignition
• Iridium tip improves cold starts
• All spark plugs tested prior to packaging and shipping
• Unique insulator design improves spark isolation
• Lower voltage Requirements for longer coil life

Emmissions 2

This part is legal for sale and use on Emissions Controlled Vehicles when used in accordance with the manufacturers application guide because it is a direct or consolidated replacement part. The following vehicles are considered Emissions Controlled Vehicles:

• 1966 and newer U.S. manufactured California Certified vehicles
• 1968 and newer U.S. manufactured Federally Certified vehicles
• 1968 and newer Foreign manufactured vehicle