RPOARCHIVE
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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    L78 Factory-verified

    Chevrolet · Regular Production Option

    Engine - V8, 396 Cu. In. Special Hi. Perf.

    Years 1963–79 Models 5 Factory citations 8

    Also described as 396ci 375 hp V8396ci 375 hp Turbo-Jet V8396ci 425hp V8 (Turbo-Jet Mark IV)396 CID V8 375hpV8 engine - 396 Special Hi-performance

    Documented applications

    Camaro
    • 1967–1969 Factory-verified

      SS; top RPO big block

      GM Heritage factory kit — 1967 Chevrolet Camaro, p.189.
      GM Heritage factory kit — 1969 Chevrolet Camaro, p.44.
    • 1970 Factory-verified

      SS only

      GM Heritage factory kit — 1970 Chevrolet Camaro, p.8.
    Chevelle / El Camino
    • 1966–1970 Factory-verified
      GM Heritage factory kit — 1966 Chevrolet Chevelle, p.14.
      GM Heritage factory kit — 1970 Chevrolet El Camino, p.4.
    Corvette (C1 / C2)
    • 1965 Factory-verified

      $292.70; 2,157 built; first Corvette big-block, mid-year intro; kit rates it 396ci/425hp (Holley R3124A #3868826)

      GM Heritage factory kit — 1965 Chevrolet Corvette, p.14.
    Nova / Chevy II
    • 1968–1970 Factory-verified
      GM Heritage factory kit — 1968 Chevrolet Nova Coupe, p.81.
      GM Heritage factory kit — 1970 Chevrolet Nova, p.63.

    This page aggregates every documented appearance of L78 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.