Product Summary

365, 390, 322, 392, 371, A Piston Ring Style

    Key Specs

    MFG. Part #
    BrandSpeedway Motors
    Piston Ring StyleA
    Piston Ring Diameter

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    Replacement cast piston rings for 4" bore applications. Available in .030, .040 and .060 oversizes.

    (2) 5/64" and (1) 3/16".

    Item Details

    1953-56 Buick 322
    1956-63 Cadillac 365/390
    1957-58 Chrysler 392
    1957-60 Oldsmobile 371

    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.


    MFG. Part #
    BrandSpeedway Motors
    Piston Ring StyleA
    Piston Ring Diameter
    Speedway Motors Catalog Part #910-139
    Piston Ring DesignConventional
    Top Ring MaterialCast Iron
    Top Ring Thickness5/64"
    Second Ring MaterialCast Iron
    Second Ring Thickness5/64"
    Oil Ring Thickness3/16"
    Oil Ring TensionStandard Tension
    Sold in QuantitySet