Autolite AR3910X Racing Spark Plug, 14mm, 3/4 Reach, Set of 8

Autolite Racing spark plugs feature a X gap ground electrode, anti-corrosive nickel plating, and large ground electrode for better heat transfer. Heat range needed with Standard tip or Power tip Coldest. 

• 14 mm plug
• .75" reach
• 5/8" hex
• Gasket seat
• Non-resistor
• X gap ground style
• Set of 8
• Vendor Number: AR3910X

Spark Plug Application Chart

Heat Range Chart (PDF)

Racing Plug Tech Note (PDF)

Understanding Heat Range (PDF)

Autolite Cross Reference Chart (PDF)