Evolution 4-8 (4G63) Valve Spring Kits

GSC Power-Division Beehive Valve Spring Kit with Ti retainer for all 4G63s includes 16 titanium retainers and 16 beehive valve springs. This set can be used for EVO 1-7 & EVO 8/9 if you are looking to replace the OEM retainers. Our beehive spring utilizes advanced material heat treatment methods for superior load loss capabilities. These springs have the highest level of spring load retention while still maintaining good fatigue throughout the life of the spring. Beehive springs allow for the use of a smaller, lighter retainer allowing for higher RPM and more valve control. 

• Max RPM: 8,500 RPM
• Max boost: 30 psi

GSC Power-Division Valve Keeper (Lock) Set for Mitsubishi 4G63T. Comes as a set for 16 locks (32 pieces) Suitable for all GSC Power-Division valve spring and retainer kits, as well as the OEM as an alternative to expensive dealership parts. 

GSC Power-Division OEM Replacement Valve Spring Seat Set for 4G63T. Perfect for replacing old seats when upgrading to a high performance spring kit like the GSC Beehives. Same thickness as OEM, so no spring pressure change when using these. Sold as a set of 16.

GSC Power-Division Conical Valve Spring Kit with Ti retainer for 4G63T includes 16 titanium retainers and 16 conical valve springs. The GSC5079 kit is designed to work with the OEM spring seat or GSC1004. 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. Conical springs allow for the use of a smaller, lighter retainer and have a varying spring rate allowing for higher RPM and more valve control.  GSC Power Division Pressure Conical Spring

• Max RPM: 10,500 RPM
• Max boost: 50 psi

GSC Power-Division Beehive Valve Spring Kit for the EVO 8/9 includes 16 beehive valve springs only. These are a replacement for the factory beehive springs and will work with the factory seat and retainer for an easy and inexpensive upgrade. Our beehive spring is made with an ovate wire which utilizes advanced material heat treatment methods for superior load loss capabilities. These springs have the highest level of spring load retention while still maintaining good fatigue throughout the life of the spring. GSC Power Division Beehive Spring 4G63T

• Max RPM: 8200 
• Max boost: 25 psi 

***For EVO 8/9 ONLY***

***For EVO 1-7 and DSM, please see GSC5040 which includes springs and Ti retainers***

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 Beehive Valve Spring Kit with Ti retainer for all 4G63s includes 16 titanium retainers and 16 beehive valve springs. This kit is capable of 10,500 RPM with as much as 12.1mm lift cams (net valve lift max due to seal to bottom retainer contact). These are a must have for anyone pushing the limits. If you have had problems with valve float or throwing rocker arms, this is the spring set that will cure your problems for good. Our beehive spring utilizes advanced material heat treatment methods for superior load loss capabilities. These springs have the highest level of spring load retention while still maintaining good fatigue throughout the life of the spring. Beehive springs allow for the use of a smaller, lighter retainer allowing for higher RPM and more valve control.

• Max RPM: 10,500 RPM
• Max boost: 44 psi
• Up to 12.1mm lift cams

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