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The Ferrea GM LS1 Pro PAC alloy dual valve spring set of 16 is supplied as a matched dual-spring set intended for LS1 valvetrain applications. Dual spring construction helps control spring rebound and resist float at higher RPMs while the PAC alloy aims to preserve spring geometry under load. This set is intended for full-valve-train replacement or performance refreshes on LS1-based engines.
Ferrea GM LS1 Pro PAC Alloy Dual Valve Spring - Set of 16
