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GSC P-D Mitsubishi Evo X 2008 - 2015 4B11T High Pressure Single Conical Valve Spring and Ti Retainer Kit

GSC P-D Mitsubishi Evo X 2008 - 2015 4B11T High Pressure Single Conical Valve Spring and Ti Retainer Kit

Regular price $680.00 $0.00 Unit price per
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The GSC Power-Division high pressure conical valve spring with titanium retainers for the Evo X includes a full set of 16 titanium retainers, 16 conical valve springs and 16 valve spring seats.

Vehicle Fitment:
Mitsubishi 4B11T
2008-2015 Evolution X

• IN: 112 lbs @ 1.294" / EX: 110 lbs @ 1.300" install height
• IN: 259 lbs @ 0.849" / EX: 257 lbs @ 0.855"
• Up to 11.30mm lift cams

(16) Beehive Valve Springs
(16) Titanium Retainers
(16) Valve Spring Seats

More Info:
True conical valve springs are not a new concept and are industry proven to provide several key advantages over traditional spring designs. A major advantage of conical springs vs. traditional cylindrical or beehive springs is the damping and removal of valvetrain harmonics.



  • Seat Pressure - 93LBS @ 1.352"
  • Seat Pressure Open - 238LBS @ .912"
  • Coil Bind - .754"
  • Max Lift @ (valve) - .535" (13.6mm)

Of the three designs, conical springs are the front runners in valvetrain harmonic stability. Utilizing a varying coil diameter as well as coil spacing, a conical spring acts as a natural harmonic damper in the transfer of valvetrain shock. This translates to less stress, less wear, and a longer life of the included components.

This level of protection is needed in today’s engines being pushed to their physical and mechanical limits by aftermarket modifications. Every GSC conical spring offers a super finished surface treatment to go along with the patented, multi-step heat treatment process. The finished product is an extremely reliable, high-performance spring allowing the users to push higher RPMs, use more aggressive cam profiles, and turn up higher boost pressures.

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