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SKU: 3997.001-1 | UPC: GSC3997.001-1
GSC P-D Porsche GT3 Cup 996/997 Intake/Exhaust Valve Guide Standard Style +.001in OD - Single
Engineered for Porsche 911 GT3 Cup race cars with 996 and 997 chassis this GSC Power-Division valve guide delivers exact valve stem alignment. The +.001in outer diameter suits heads needing slight oversize fit while maintaining stock internal clearances. Race teams rely on it for sustained high RPM operation and reduced wear in 3.6L Mezger engines.
Key Features
- Manganese Bronze Material: Resists galling and wear under extreme heat and oil starvation conditions common in GT3 Cup racing
- +.001in Outer Diameter: Provides press-fit security in worn or machined heads without altering bore size excessively
- Standard Internal Style: Matches OEM valve stem tolerances for direct compatibility with stock or performance valves up to 11mm
- Precision CNC Machined: Ensures consistent guide length of 1.250in and groove placement for optimal seal and heat transfer
- Intake/Exhaust Universal: Identical design works for both sides simplifying inventory for full engine rebuilds
Product Notes
- Sold as single unit ideal for replacing one damaged guide
- Inspect cylinder head bore diameter prior to install typically 0.437in nominal
- Arrives ready to press in protective sleeve packaging
Installation Notes
- Professional installation recommended.
- Use GSC or Porsche-specific valve guide driver tool for straight press fit
- Compatible with OEM head castings and aftermarket valves from Ferrea or Supertech
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1999-2005 | Porsche | 911 | GT3 Cup (996) |
| 2006-2011 | Porsche | 911 | GT3 Cup (997) |
Why Choose GSC Power-Division?
- Backed by wins in Porsche Cup series and endurance racing worldwide
- Manufactured to aerospace tolerances in USA facilities
- Focus on valvetrain durability for 9000+ RPM applications
Frequently Asked Questions
-
Q: Will this fit Porsche 996 GT3 Cup intake and exhaust heads?
A: Yes it fits both intake and exhaust positions on 1999-2005 996 GT3 Cup 3.6L engines with standard guide bores -
Q: What is the guide material and length?
A: Manganese bronze alloy with 1.250in installed length and 0.437in nominal ID for 11/32in valve stems -
Q: Does GSC provide warranty on this valve guide?
A: Limited lifetime warranty against manufacturing defects when installed by certified engine builder
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Protective foam sleeve in 4x4x1in box
- Weight: 0.05 lbs
GSC Power Division
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