top of page
Autolite AR3931 Racing Spark Plugs #3931

Autolite AR3931 Racing Spark Plugs #3931

  • High Performance Racing Non-Resistor Spark Plug
    Thread Size 14mm X 1.25
    Reach 3/4"
    Hex Size 5/8" (16mm)
    Seat Type Gasket
    Tip Configuration Short Projection
    Resistor Non Resistor
    Metal Type Copper
    Terminal Type No
    • Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof)
    • Multi-rib insulator reduces danger of "flash-over"
    • One-piece terminal post adds strength
    • Resistor reduces radio frequency interference (RFI) and electrode erosion
    • Cold-formed steel shell precision rolled threads
    • Full copper core electrode provides better performance in all conditions
bottom of page