Product Summary

Flat Spark Plug Seat Style, Gasket Seat Taper, Resistor

    Key Specs

    MFG. Part #3924
    Thread Pitch14mm

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    Autolite 3924 Details

    These copper core spark plugs are recommended for all 2006 and up Edelbrock flathead Ford cylinder heads. They are guaranteed to deliver quick starts, good fuel economy and smooth acceleration. Works very well with our flathead ignitions.

    Spark plugs are SOLD EACH.

    Item Details

    5/8" Hex, 3/4" Reach, 14mm Threads


    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 3924 Specifications

    MFG. Part #3924
    Thread Pitch14mm
    Spark Plug Seat StyleFlat
    Seat TaperGasket
    Spark Plug Reach0.75"
    Thread Length0.6"
    Core MaterialCopper
    Tip MaterialNickel Alloy
    Overall Length2.97"
    Wrench Size5/8"
    Sold in QuantityEach
    GTIN Code00009100039248