High Rev. Single Spring Kit

Everything-you-need-to-prepare-your-heads-for-high-lift-cam-use-and-high-RPM-applications.-Kits-include-Single-Hi-Performance-Valve-Springs,-Chromoly-Retainers-and-Hardened-Valve-Locks.-Same-Single-Springs-as-P/N:-4040. (SKU: 40450)