Upgrade your Cummins valve springs and retainers with our Fleece Performance spring and retainer kit. Our springs are manufactured from super clean Hi-Tensile Chrome Silicon steel with a proprietary multi-step heat treating process that minimizes load loss.
These springs have a seat pressure of 105 pounds with an open pressure of 195 pounds at maximum lift. The retainers are thru-hardened 4140 chome moly steel and have a black oxide finish.
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