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Moroso advance curve kit for 1957–1975 GM non‑HEI distributors. Designed to modify the mechanical advance characteristics of older GM distributors, this kit lets builders and restorers adjust ignition timing behavior to better match engine requirements. It provides a direct-fit solution for period-correct tune-up or performance refinement on classic GM V8 applications from the stated years.
Moroso 57-75 GM Non HEI Advance Curve Kit
