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Fitment notes and restrictions
Description
Protect a high-heat 4G63T build with the correct single exhaust valve
GSC Power Division 2005-01 is one standard-size super-alloy exhaust valve for the supported Mitsubishi 4G63T cylinder heads. Its chrome-polished stem, back-cut head, and under-head dish are intended for high-output engines where exhaust temperature and sealing stability matter.
Key Features
- GSC Power Division 2005-01 is sold as one exhaust valve, not a set of eight
- Super-alloy construction is intended for exhaust temperatures up to 2,000 degrees Fahrenheit
- Chrome-polished stem supports a smooth bearing surface and lubricity
- Swirl-polished, back-cut head promotes airflow while retaining strength
- Under-head dish reduces valve mass
- Standard 30.5 mm head diameter for the verified 4G63T applications
Fitment
| Years | Make | Model | Verified Trim or Engine |
|---|---|---|---|
| 1992-2006 | Mitsubishi | Lancer Evolution I-IX | 4G63T |
| 1990-1999 | Mitsubishi | Eclipse | GST or GSX with 4G63T |
| 1990-1998 | Eagle | Talon | TSi with 4G63T |
| 1990-1994 | Plymouth | Laser | RS Turbo with 4G63T |
| 1991-1992 | Mitsubishi | Galant | VR-4 with 4G63T |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | 2005-01 |
| Position | Exhaust |
| Quantity | One valve |
| Material | Super alloy |
| Head Diameter | 30.5 mm, standard size |
| Stem Diameter | 6.6 mm |
| Overall Length | 109.20 mm |
| Stem Finish | Chrome polished |
| Head Design | Swirl polished, back cut, under-head dish |
| Engine Family | Mitsubishi 4G63T |
What's Included
- One GSC Power Division 2005-01 super-alloy exhaust valve
- Valve seals, guides, springs, retainers, locks, machining, and the other seven exhaust valves are not included
About GSC Power Division
GSC Power Division develops performance valvetrain components with application-specific stem, head, length, material, and airflow geometry. Its super-alloy exhaust valves are intended for severe exhaust heat, but the cylinder head and valve-seat condition must be measured before installation.
Related Parts
- No internal part is linked because guides, seals, springs, retainers, locks, and companion valves must match the exact 4G63T cylinder-head build and GSC 2005-01 dimensions.
FAQ
What is the 2005-01?It is one standard-size super-alloy exhaust valve for the supported Mitsubishi 4G63T applications.
Is this a complete set of exhaust valves?No. The verified quantity is one valve; a four-cylinder head normally requires eight exhaust valves when replacing a complete set.
What is the valve-head diameter?The verified head diameter is 30.5 millimeters, the standard size for the listed configuration.
What are the stem diameter and overall length?The published dimensions are a 6.6-millimeter stem and a 109.20-millimeter overall length.
Is this the stainless-steel version?No. This listing is the super-alloy version intended for higher exhaust-gas temperatures.
Does it fit every 4G63 engine?No. Confirm the turbocharged 4G63T cylinder head, valve size, stem size, overall length, seat geometry, and application before ordering.
Does a standard-size valve eliminate machining?No. The guide, seat, installed height, sealing contact, and complete valvetrain geometry still require professional inspection and correction as needed.
What should be checked after assembly?Verify valve-to-seat contact, guide clearance, installed height, spring pressure, retainer and lock engagement, piston clearance, and leak-down before running the engine.
Installation Instructions
- Confirm the exact 4G63T cylinder head and GSC Power Division 2005-01 dimensions before disassembly.
- Have a qualified engine machinist measure the original valve, guide, seat, installed height, and cylinder-head condition.
- Clean and inspect the replacement valve without scratching the polished stem or sealing face.
- Machine or service the guide and seat only to the current GSC and engine-builder specifications, then verify concentric contact and clearance.
- Install the correct seal, spring, retainer, and locks for the complete valvetrain combination and measure installed height and pressure.
- Check piston-to-valve clearance, rotate the engine by hand, perform leak-down checks, and follow the engine builder's startup procedure.
California Proposition 65 Warning: This product can expose you to chemicals including antimony oxide and other chemicals known to the State of California to cause cancer or reproductive harm. For more information, visit www.P65Warnings.ca.gov.
