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The Supertech dual valve spring kit for Mitsubishi 4G63 engines supplies paired inner and outer springs to improve valve control and reduce the likelihood of valve float at higher RPMs. Intended to offer layered spring rates for stable valve seating, the dual arrangement provides additional margin where single springs may reach their limits. This kit is specified for 4G63 applications requiring enhanced valve retention.
Supertech Mitsubishi 4G63 Dual Valve Spring Kit
