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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    L33 Factory-verified

    Chevrolet · Regular Production Option

    409ci 340 hp V8 (hydraulic cam)

    Years 1963–65 Models 1 Factory citations 3

    Also described as 409 CID V8 340hp

    Documented applications

    Impala / Full-Size
    • 1963-65 Factory-verified

      Low performance-hydraulic cam/1-4bbl

      GM Heritage factory kit — 1963 Chevrolet, p.36.
    • 1963–1965 Factory-verified
      GM Heritage factory kit — 1963 Chevrolet, p.36.
      GM Heritage factory kit — 1965 Chevrolet, p.59.

    This page aggregates every documented appearance of L33 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.