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The Moroso throttle return spring kit for 4150 Holley/HP-series carburetors supplies replacement return springs intended for carburetor-mount installations. It restores reliable throttle-return action and provides a direct-fit solution where 4150/HP-series linkage requires carburetor-mounted spring hardware for safe operation.
Moroso 4150 Holley/HP Series Throttle Return Spring Kit - Carburetor Mount
