SKU: 5016
GSC Power-Division Nissan VQ35 Extreme Conical Valve Spring Titanium Retainer and Spring Seat Kit 2003-2008 350Z 2003-2007 G35
The GSC Power-Division Extreme Conical Valve Spring Titanium Retainer and Spring Seat Kit for Nissan VQ35DE non-Rev-Up and VQ35HR engines fits 2003-2008 Nissan 350Z and 2003-2007 Infiniti G35 models. This complete kit includes 24 dual conical springs, 24 titanium retainers, and 24 titanium spring seats to maintain valve control at extreme RPMs with 120 lbs seat pressure at 1.780 inches and 340 lbs open pressure at 0.480 inch lift. Build confidence for high-revving track use with reduced valvetrain weight and precise engineering.
Key Features
- Dual Conical Springs: Progressive rate chromoly steel inner and outer springs reduce harmonics and support 10,000 RPM operation without float
- Titanium Retainers: Lightweight 10CP titanium Super Lock retainers at 10.2 grams each cut 432 grams total valvetrain mass versus OEM steel
- Titanium Spring Seats: Ti64A-4V seats provide durability and additional mass reduction for quicker revving
- High Pressure Ratings: 120 lbs combined seat load at 1.780 inches installed height and 340 lbs at 0.480 inch lift for firm valve action
- Kit Completeness: 24 inner springs (0.945 inch ID, 1.134 inch OD), 24 outer springs (1.200 inch ID, 1.496 inch OD), full set for VQ35 24-valve heads
Product Notes
- Verify installed spring height and valve lash after installation to ensure proper clearance
- Springs rated for coil bind at 1.150 inches with max loads over 1200 lbs per spring
- Special order item, confirm stock before purchase
Installation Notes
- Professional installation recommended.
- Measure stem height and check for Rev-Up engine exclusion before install
- Compatible with stock or aftermarket valves and locks, no special hardware needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2003-2008 | Nissan | 350Z | VQ35DE / VQ35HR |
| 2003-2007 | Infiniti | G35 | Coupe / Sedan VQ35DE |
| 2007-2008 | Infiniti | G35 | Coupe VQ35HR |
Why Choose GSC Power-Division?
- Proven valvetrain components trusted in drag racing and Super Street classes
- Made in USA with tight tolerances for consistent performance
- Engineered for durability under sustained high boost and RPM abuse
Frequently Asked Questions
-
Q: Does this kit fit VQ35DE Rev-Up engines?
A: No, designed for non-Rev-Up VQ35DE and VQ35HR only, confirm your engine code -
Q: What materials are used in the retainers and seats?
A: 10CP titanium retainers and Ti64A-4V titanium seats paired with chromoly steel springs -
Q: What is the warranty on these valve springs?
A: GSC offers a one-year warranty against manufacturing defects with proper installation
Shipping & Handling
- Method: UPS Ground or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Securely boxed 10 x 8 x 6 inches
- Weight: 1.90 lbs
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