SKU: 5014
GSC P-D Nissan VQ35 Conical Valve Spring and Titanium Retainer Kit for 2003-2008 350Z 2003-2007 G35
Equip your Nissan VQ35DE or VQ35HR engine with the GSC Power-Division conical valve spring and titanium retainer kit designed for 2003-2008 Nissan 350Z and 2003-2007 Infiniti G35 models. This complete 24-piece spring and retainer set delivers stable valvetrain control at extreme RPMs preventing valve float during aggressive driving or track use. Engineered for seamless integration these components support higher rev limits and consistent power delivery across the RPM range.
Key Features
- Conical Spring Design: Reduces overall valvetrain mass by 20 percent over stock while controlling harmonics for revs up to 10,000 RPM
- Titanium Retainers: 7075 T6 aircraft-grade titanium construction cuts retainer weight by 12 grams each improving dynamic response
- Dual Spring Pressures: Seat pressure 106 lbs at 1.720 inches open pressure 239 lbs at 1.170 inches with 10.5mm max lift capability
- Super Clean Chromoly Springs: Heat-treated for fatigue resistance with Beehive conical profile minimizing natural frequency issues
- Complete Kit: Includes 24 springs 24 retainers and seals for full VQ35DE/HR cylinder head installation
Product Notes
- Verify valve stem heights post-installation to ensure proper installed height
- Pair with performance camshafts for maximum gains in high-RPM power
- Special order item expect 2-5 business day processing before shipment
Installation Notes
- Professional installation recommended.
- Use a high-quality valve spring compressor tool rated for high pressures
- Compatible with OEM valve locks keepers and aftermarket cams up to 13mm lift
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2003-2008 | Nissan | 350Z | All |
| 2003-2007 | Infiniti | G35 | Coupe Base Sport |
| 2003-2007 | Infiniti | G35 | Sedan Base |
| 2004-2006 | Infiniti | G35x | Sedan |
| 2003-2008 | Infiniti | FX35 | All |
| 2003-2007 | Nissan | Murano | All |
Why Choose GSC Power-Division?
- Proven in drag racing and circuit events with thousands of installations
- Machined to micron tolerances for perfect fit and zero bind
- Backed by one-year unlimited mileage warranty against defects
Frequently Asked Questions
- Q: Does this kit fit both VQ35DE and VQ35HR engines?
A: Yes it is direct fit for all VQ35DE 2003-2006 and VQ35HR 2007-2008 variants in listed vehicles with no modifications needed - Q: What materials are used in construction?
A: Springs are Super Clean chromoly steel retainers are 7075 T6 titanium seals are high-temp Viton for durability - Q: What warranty coverage applies?
A: One-year warranty covers manufacturing defects when installed by certified mechanic with proof of proper spring height
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: Special order ships within 2-5 business days
- Packaging: Foam-protected sturdy cardboard box 12 x 8 x 6 inches
- Weight: 5.2 lbs
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