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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    L-31 Factory-verified

    Oldsmobile · Regular Production Option

    455 4-bbl high compression, 365 hp (Cutlass Supreme SX / performance 455)

    Years 1970 Models 1 Factory citations 1

    Documented applications

    Cutlass / 4-4-2
    • 1970 Factory-verified

      Factory list: "Engine Option — 455 Cu. In. V-8 H.C. 4-Barrel; M40 Mandatory; Dual Exhaust System Included"

      GM Heritage factory kit — 1970 Oldsmobile 442 Info Kit, p.228.

    This page aggregates every documented appearance of L-31 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.