Lancer Evolution 4-8 (4G63T)

GSC Power-Division Super Alloy Exhaust Valves for 4G63T are for those running high horsepower, high EGT set ups that need a valve that will last in 2000°F conditions. The Super Alloy Exhaust valves have chrome polished stems to create a smooth, durable finish for added life and better lubricity, especially when paired with the GSC Manganese bronze valve guides. Strength, heat resistance, and performance are engineered into every valve. Under head dish is maximized for weight savings while swirl polished and back cut heads promote better air flow without sacrificing durability. 

GSC Power Division Valve Spring Mitsubishi  GSC4041 CNC turned Chromoly valve spring seats are meant for the 4G63 platforms pushing to the absolute limits, with an additional 0.035” built in, the need for shims and potential wrong stacking of shims is eliminated when higher spring seat pressure is required. Sold as a set of 16.

GSC Power-Division Race Conical Spring kit with Ti Retainer 4G63T

1,000+ HP BUILDS ONLY

Trying to break records? Trying to win races? This is the valve spring kit for the 4G63T that will allow you to take your engine package to the next level. Not for street cars or sub 1,000 HP builds, in that case please see our GSC5040 or GSC5041 beehive spring kits. Capable of controlling the valves with 60+ psi of boost at 11,000 RPM with 12.1mm lift cams. In racing, every tenth of a gram matters, so our redesigned Ti Retainer is 10% lighter and smaller, while still adding the strength needed to keep the valvetrain in one piece at 11,000 RPM.

The GSC5078 kit also includes our GSC4041 chromoly CNC replacement valve spring seats that are 0.035" thicker than the OEM part. Able to use NEW OEM valve spring keepers or our GSC1003 keeper kit. No need for special aftermarket locks that have the potential of being the wrong angle. Sold as a set: 16 conical valve springs, 16 Lightweight Ti Retainers, 16 thick CNC chromoly spring seats.

• Max RPM: 11,000 RPM
• Max boost: 60+ psi