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The Ferrea dual valve spring set for Mitsubishi 4G63/4G63T engines is rated at 305 lbs/in and supplied as a 16-piece kit. These springs are specified for that engine family to provide the required seat and open rates in dual-spring configurations, intended to pair with compatible retainers and inner springs to maintain stable valvetrain operation under demanding conditions. Sold as a matched set.
Ferrea Mitsubishi 4G63/4G63T 305lbs Rate Inch Dual Valve Spring - Set of 16
