In the past few years, more professional racing championships, from Winston Cup and IRL to NHRA Pro Stock, have been won using PSI valve springs than any other brand!

PSI’s ability to design and manufacture the highest quality valve springs can be attributed to their exclusive manufacturing techniques.

The process begins with premium, high-strength alloy wires that are fully inspected.

PSI employs new, state-of-the-art tooling and machinery in the actual winding and production of all springs.

The final shot peening and multistep heat treatment processes complete an intensive process that results in a stronger, more consistent, more reliable valve spring than any other brand in racing today.