Supertech Mitsubishi EVO X 4B11 Dual Valve Spring Kit (Use OEM Seal-Seat)

Supertech is well-known for making performance engine components, and this dual valve spring kit for the Mitsubishi Lancer Evolution X with the 4B11 engine is a prime example. If you're rebuilding the top end of your EVO X for serious performance, stronger valve springs are a critical part of the equation. They help ensure your valves close quickly and reliably, even at high RPMs, preventing valve float and keeping your engine running smoothly under demanding conditions.

This kit uses dual springs, meaning there are two springs working together for each valve. This setup offers increased spring pressure and better control over valve motion compared to single springs. The springs in this kit are designed to work with your OEM seal and seat, simplifying installation. They are made from high-strength materials to withstand the rigors of performance driving and racing, ensuring consistent operation over time. When building a high-revving or forced-induction 4B11 engine, upgraded valve springs like these are essential for reliability and performance.

This kit is designed to be a direct replacement for your stock valve springs, but it's important to note that installing performance valve springs typically requires specialized tools and a good understanding of engine assembly. Always refer to the manufacturer's installation instructions for detailed guidance on proper fitment and procedure. This kit is intended for use with OEM seals and seats.