When GSC set out to create the best performing and longest lasting valves available, they knew they would need to turn to the cutting edge of design technology. All GSC Power-Division performance valves are created with advance 3D design and simulation programs, resulting in a stronger and higher flowing valve head concept. All prototype valves are precision tested against the competition to ensure the highest performing design available. Higher quality materials mean less head distortion for better sealing under extreme conditions and more consistent performance through the life of the valve.

Stage 1 Single Beehive valve spring set for the 03-06 Evolution 8 & 9 uses the factory spring seat and the factory retainer. This is a great option for those wanting to run GSC S1 or S2 camshafts on a street application, or anyone wanting to run more than 11mm of lift on the intake and 10.6mm on the exhaust. RPM limit 9,000. The Stage 2 Single Beehive valve spring set, includes new 4340 Chro-molly spring seats and Titanium Retainer set. This kit is capable of 11000+ RPMS, with as much as 12.5mm of lift. This is a must have for anyone pushing the limits of their Evolution. If you have had problems with valve float or throwing rocker arms this is the spring set that will cure your problems.

GSC Power-Division ZERO-TICK lifters for the Mitsubishi 4G63 utilize a stiffer spring inside to help keep the lifter at its operating height even when oil pressure is low.

GSC Power-Division Viton Valve Stem Seals for the Evo 8 & 9 include the entire 5.5mm valve size seal set (8 intake and 8 Exhaust)so you will have no guess-work when it comes to installation. These stem seals are an upgrade from the standard OEM material to help cope with the higher heat caused by high performance 4G63 engines.