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GSC Intake or Exhaust Valve Guide Standard (Porsche 996 / 997 GT3 Cup) GSC3997

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gsc3997
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GSC Intake or Exhaust Valve Guide for Porsche 996/997 GT3 Cup – GSC3997

The GSC3997 Valve Guide is designed to fit either the intake or exhaust side of Porsche 996 and 997 GT3 Cup engines. Manufactured by GSC Power Division, this standard-size guide is precision-machined for 6mm valve stems and is ideal for high-performance engine builds.

Fitment and Quantity Notes

  • Standard size – available individually or in sets of 12
  • Oversized options – sold individually in +0.001" and +0.003" sizes
  • Complete engine build – requires 2 full sets

Technical Specifications – GSC3997

Specification Inches Millimeters
Total Length 1.673" 42.49mm
Outer Diameter 0.4160" 10.57mm
Valve Stem Diameter 6mm

Whether you're refreshing a GT3 Cup head or building a full race motor, GSC’s standard valve guide offers reliable fitment and long-term durability for intake or exhaust use.

Fitment:

- 2000-2005 Porsche 996 GT3 Cup (Intake & Exhaust)
- 2006-2012 Porsche 997 GT3 Cup (Intake & Exhaust)

Note: These guides are compatible with both intake and exhaust positions. A full engine rebuild typically requires 24 guides total (12 intake + 12 exhaust), so two sets of 12 are recommended.

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