AR-3931 Race Plug
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AUTOLITEPART NUMBER: 417-AR3931

AR-3931 Race Plug

$699
ShippingShips on Sep 08, 2026
Lowest PriceLowest Price Guarantee

5/8'' Hex, 14mm Thread, Gasket Seat - .750'' Reach
    AR-3931 Race Plug
    Autolite Race Plugs feature the latest plug design technology. Their multi-rib insulator, copper center electrode, large cut back ground electrode (covered in nickel plating and sealed inside a longer insulator to resist carbon fouling), and double terminated suppressor provide the best EMI suppression.

    NOTE: Plugs are priced individually but may only be ordered in sets of 4.
    Spark Plug Heat Ranges & Applications

Part TypeSpark Plug
Product LineAutolite Race Series Spark Plugs
BrandAUTOLITE
Package Height0.9
Package Width1.0
Package Length3.4
Weight0.1 PG
Part CategoryPerformance Parts
Seat StyleGasket
Reach (In)3/4"
Center Electrode DesignStandard / Regular
Insulator TypeShort Projection
Thread Size14mm X 1.25
Center Electrode Core MaterialCopper
Drive Size5/8" (16mm)
Gap- Factory Preset.025"/0.6mm
Center Electrode Tip MaterialCopper
Insulator MaterialCeramic
Part FitmentUniversal
ResistorNon Resistor
Vendor Part NumberAUTOLITE RACING PLUG
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
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