Cosworth Ultra-High RPM Dual Valve Spring / Retainer Set - Mitsubishi 4G63 Models (inc. 2003-2006 Evo 8/9 / Eclipse 1990-1999
Manufacturer Part # KK3813
Cosworth is a World Renowned Racing Company that is highly regarded due to their rich history in motorsports. These are Cosworth’s Race Valve Springs that have been designed using the latest in race technology. Built to suit extreme builds for users looking to make large amounts of power, that will exceed your average boost, and RPM limits.
Each kit will consist of dual valve springs, with matched lightweight titanium retainers, keepers, and hardened steel spring seats. The valve springs are wound from high quality chrome silicone steel, and feature chambered ends. They are then heat treated, and stress relieved for long term performance and reliability.
Finally, the Cosworth Ultra Race Valve Spring Kits are compatible with the Cosworth High Performacne Valves.
RallySport Guarantee - 30 Days
Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.
RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.
The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.