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SKU: 2149-12
GSC P-D Nissan RB26DETT 31.15mm Head +1mm OS 103.24mm Long +1.5mm Tip Exhaust Valve - Set of 12 1989-2002 Skyline GT-R
Upgrade your Nissan RB26DETT engine with GSC Power-Division exhaust valves designed specifically for Skyline GT-R models from 1989 to 2002. This set of 12 +1mm oversize valves features a 31.15mm head diameter and 103.24mm length with +1.5mm extended tip for enhanced sealing and exhaust flow in high-performance builds. Engineered for reliability under extreme boost and RPM these valves deliver consistent power gains in R32 R33 and R34 GT-R applications.
Key Features
- 31.15mm Head +1mm OS: Oversize head diameter increases exhaust flow area without compromising valve train geometry for better top-end power in turbocharged RB26DETT engines
- 103.24mm Length +1.5mm Tip: Extended tip improves valve seal and guides directly into stock or aftermarket seats reducing wear during high heat cycles
- One-Piece Forged 21-4N Stainless: High-strength stainless steel construction resists fatigue and maintains shape at elevated temperatures for race-level durability
- 7mm Stem Diameter: Precise stem sizing ensures compatibility with RB26DETT guides and springs while minimizing friction for smoother operation
- Swirl Polished Finish: Polished surfaces reduce airflow turbulence promoting efficient scavenging and higher horsepower output
Product Notes
- Valve seats and guides may require machining for +1mm oversize fitment
- Pair with GSC valve springs for optimal performance and spring pressures
- Ships in protective foam-lined box to prevent damage
Installation Notes
- Professional installation recommended.
- Machine valve seats to accommodate +1mm oversize head diameter
- Compatible with OEM or GSC valve springs and retainers no special hardware needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1989-1994 | Nissan | Skyline | R32 GT-R RB26DETT |
| 1995-1998 | Nissan | Skyline | R33 GT-R RB26DETT |
| 1999-2002 | Nissan | Skyline | R34 GT-R RB26DETT |
Why Choose GSC Power-Division?
- Trusted by GT-R tuners for JDM engine builds with proven track records
- USA-manufactured components using premium materials for long-term strength
- Precision CNC machining ensures exact tolerances for drop-in performance
Frequently Asked Questions
-
Q: Will these fit my stock RB26DETT head?
A: Yes with minor seat machining for the +1mm oversize head these install into factory or ported R32 R33 R34 GT-R cylinder heads -
Q: What material are the valves made from?
A: Forged one-piece 21-4N stainless steel provides excellent heat resistance and strength for boosted applications over 1000hp -
Q: Do I need new springs for installation?
A: Recommended to use GSC dual valve springs for proper coil bind and pressure but compatible with upgraded OEM-style springs
Shipping & Handling
- Method: UPS Ground
- Availability: In stock - ships same or next business day
- Packaging: Foam-lined box 12 x 6 x 2 inches
- Weight: 1.8 lbs
GSC Power Division
GSC Power Division is a manufacturer of precision-engineered camshafts, valve springs, and valvetrain components designed for high-performance and competition engines across domestic, import, and diesel platforms. Founded by engineers with deep roots in motorsport, GSC Power Division components are machined to exacting tolerances and heat-treated to survive the demands of forced induction and high-rpm applications that destroy stock valvetrain parts. The brand is particularly well-known in the Mitsubishi Evo, Subaru STI, Nissan RB, and Toyota 2JZ communities where aggressive camshaft profiles are essential for extracting maximum power from turbocharged four-cylinder and six-cylinder engines. Whether building for drag racing, road course competition, or a high-powered street car, GSC Power Division camshafts and valve springs are a proven upgrade path. Popular Upgrades GSC Power Division S1, S2, and S3 camshafts are the most popular selections, with each profile offering progressivel...
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