Product Summary

Universal Fit, Gasket Spark Plug Seat Style

    Key Specs

    MFG. Part #AR50

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    Autolite AR50 Details

    Autolite Racing spark plugs feature a cut back ground electrode, anti-corrosive nickel plating, and large ground electrode for better heat transfer. Heat range Cold.

    • Power Tip (Projected Tip)
    • 14 mm plug
    • 3/4" reach
    • 13/16" hex
    • Gasket seat
    • Non-resistor
    • Vendor Number: AR50

    Note: Please use the Vendor Number to reference the PDF chart links listed.

    Item Details

    Power Tip
    Vendor Part Number AR50



    CARB Warning

    For race/ off road use or for use on pre-1966 vehicles.

    Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

    Autolite AR50 Specifications

    MFG. Part #AR50
    Speedway Motors Catalog Part #373-50
    Spark Plug Seat StyleGasket
    Seat TaperGasket
    Spark Plug Reach0.75"
    Thread Pitch14mm
    Insulator TypeProjected
    Spark Plug Heat Range2
    Core MaterialCopper
    Tip MaterialNickel Alloy
    Overall Length14.00"
    Wrench Size13/16"
    Sold in QuantityEach
    GTIN Code009100017703