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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    XS Confirmed

    Pontiac · Regular Production Option

    389 Tri-Power Ram Air engine (360 hp) — first factory Ram Air

    Years 1966 Models 1

    Documented applications

    GTO
    • 1966 Confirmed

      GTO; XS is the engine block letter code; ordered as dealer-installed/COPO-style package

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