GSC 4G63 Evo DSM Intake Valves




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GSC Power-Division intake valves for the 4G63 Evo and DSM. Intake valves are sold as a set of 8 or individually as needed. Available in the standard 34mm size or +1mm oversized. Valve stem diameter is 6.6mm, overall length is 109.60mm.

Vehicle Fitment:
Mitsubishi 4G63
1992-2006 Evolution I-IX
1990-1999 Eclipse GST/GSX
1990-1998 Talon TSi
1990-1994 Laser RS
1991-1992 Galant VR4

GSC Intake Valves:
Part Number: Head Diameter Size: Material: Quantity:
GSC 2002-8 STD Size (34mm) 21-4N Set of 8
GSC 2002-01 STD Size (34mm) 21-4N Single Valve
GSC 2004-8 +1mm (35mm) 21-4N Set of 8
GSC 2004-01 +1mm (35mm) 21-4N Single Valve
More Info:
Using advanced 3D design and simulation software, GSC has created a stronger and higher flowing valve head design. GSC flow tests prototype valve heads in the specific applications to ensure the highest flowing valve head available on the market today. With the materials used, GSC offers less valve distortion at the face than any of the tested designs. Less distortion allows for better sealing under extreme conditions and more consistent performance throughout the life of the valve.
  • Swirl polished heads for smoother air flow over the valve
  • Back cut to reduce valve weight for higher RPM, higher boost pressure, and allow for more aggressive cam profiles without increasing valve spring seat pressures
  • Valve stems are micro polished to allow for less oil retention on the stem, which creates less drag on the stem to guide for a smoother motion
  • Intake valves are a modified 21-4n stainless and exhausts are a modified 23-8n stainless material for high heat capacity while maintaining longevity
  • Valve tips are either hardened or have a stelite wafer tip fused so that the tip is within 5 Rockwell C of the rocker or valve tappet for extended life and less wear
  • Valve tip lengths - GSC takes extra time to adjust tip heights on the applications to require less tipping of the valve, to maintain proper tip height for proper valve train geometry, and to cut down on install times when setting valve lash
  • GSC has also adjusted the keeper groove to properly balance intake and exhaust spring pressures to reduce the use of valve spring shims and maximize performance from GSC spring and retainer kits
  • Valves will work with an OEM keeper/lock or, when available, GSC upgraded keeper/lock. It is not mandatory, but it is suggested, that any valve lock not be reused on performance applications due to material grooving
Photos are for reference.
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Customer Reviews

Based on 4 reviews
Jesus Rojas (Sunnyside, WA, US)
Stock issues

Maybe just being more accurate on what items are in stock and which are not. That way we can plan things out with our local shops...

Mr. Karel Muñoz (Panama City, 8, PA)
Great Quality

I'm very pleased with how my head turn out, great products and fast delivery!

Adrian Casillas (Guadalajara, JAL, MX)
Excellent product

Excellent product

Cristopher Ramirez (Santiago, RM, CL)

thanks and sorry for the problem before, but my spare parts just arrived

Glad we were able to get things figured out for you : ) Thank you for shopping with us.

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