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Precision Manganese Bronze Valve Guides for the Nissan VQ35DE Engine
The Supertech SPTGDE-NVQ35-12 is a set of 12 manganese bronze intake and exhaust valve guides machined to OEM dimensions for the Nissan VQ35DE engine found in the 2003-2006 Nissan 350Z and 2003-2007 Infiniti G35. With an outside diameter of 10.079mm, a length of 42mm, and a stem bore of 5.985mm, these guides are a direct replacement for worn or damaged factory guides during engine rebuilds, head reconditioning, or performance builds. Manganese bronze provides superior wear resistance and thermal conductivity compared to cast iron factory guides, making the SPTGDE-NVQ35-12 a preferred choice for both street rebuilds and high-performance applications. Note: 12 guides cover one cylinder head. A full engine set requires 24 guides (two sets).
Key Features
- Precision-machined manganese bronze construction for superior wear resistance
- Outside diameter: 10.079mm
- Length: 42mm
- Stem bore (ID): 5.985mm
- Fits both intake and exhaust valve positions
- Direct replacement for Nissan VQ35DE factory valve guides
- Compatible with Supertech low-friction black nitrided valves
- Set of 12 guides (one cylinder head)
- Supertech factory precision tolerances throughout
Fitment
| Year Range | Make | Model |
|---|---|---|
| 2003-2006 | Nissan | 350Z (VQ35DE) |
| 2003-2007 | Infiniti | G35 (VQ35DE) |
Specifications
| Detail | Value |
|---|---|
| Part Number | SPTGDE-NVQ35-12 |
| SKU | SPTGDE-NVQ35-12 |
| UPC | N/A |
| Material | Manganese Bronze |
| Outside Diameter | 10.079mm |
| Length | 42mm |
| Stem Bore (ID) | 5.985mm |
| Position | Intake and Exhaust |
| Quantity | 12 (one cylinder head) |
| Application | Nissan VQ35DE |
What's Included
- 12 x Supertech SPTGDE-NVQ35-12 manganese bronze valve guides
About Supertech
Supertech Performance is a leading manufacturer of precision engine components including valves, valve springs, retainers, seats, and guides used in professional racing and high-performance street applications worldwide. Supertech guides are machined to exacting tolerances and material standards that exceed OEM specifications, making them the preferred choice of engine builders working on VQ35DE-based performance builds from mild street rebuilds to full race preparation.
Frequently Asked Questions
What is the Supertech SPTGDE-NVQ35-12?The Supertech SPTGDE-NVQ35-12 is a set of 12 precision manganese bronze valve guides for the Nissan VQ35DE engine in the 2003-2006 Nissan 350Z and 2003-2007 Infiniti G35. They measure 10.079mm OD x 42mm length x 5.985mm stem bore and fit both intake and exhaust positions, replacing worn factory guides during engine rebuilds.
How many sets do I need for a full VQ35DE rebuild?The VQ35DE has two cylinder heads with 6 cylinders each, for a total of 24 valve guide positions. Each SPTGDE-NVQ35-12 set contains 12 guides covering one head. You need two sets for a complete engine rebuild.
Are these guides compatible with stock Nissan 350Z valves?Yes. The SPTGDE-NVQ35-12 is machined to OEM stem bore dimensions and is compatible with both factory Nissan valves and Supertech's own low-friction black nitrided performance valves for the VQ35DE.
What is the advantage of manganese bronze over factory cast iron guides?Manganese bronze offers superior wear resistance, better thermal conductivity, and lower friction compared to the cast iron guides used in the factory VQ35DE heads. In performance applications with higher valve lift or sustained high-rpm use, manganese bronze guides outlast cast iron and help maintain consistent valve-to-guide clearance over longer service intervals.
Do these fit the VQ35HR engine in the 2007+ 350Z?No. The SPTGDE-NVQ35-12 is specifically dimensioned for the VQ35DE engine. The revised VQ35HR used in the 2007-2008 Nissan 350Z and later G35/G37 models uses different valve guide dimensions. Verify your engine code before ordering.
Can I install these guides without a machine shop?No. Valve guide installation requires pressing the old guides out and pressing new guides in using a hydraulic press and proper guide driver tools, followed by reaming to the correct stem-to-guide clearance. This work must be performed by a qualified machine shop or engine builder.
What stem-to-guide clearance should I run with these guides?After installation, the guides should be reamed to achieve the clearance specified by your engine builder. For a street rebuild using factory Nissan valves, typical intake clearance is 0.020 to 0.040mm and exhaust is 0.040 to 0.060mm. Consult Supertech or your machinist for performance application specs.
Are these guides sold individually as well?Yes. Supertech also offers the GDE-NVQ35-1 as a single guide for spot replacement. The SPTGDE-NVQ35-12 set of 12 is the most cost-effective option for head rebuilds requiring full guide replacement.
Installation Instructions
- Remove the cylinder head from the engine and clean all mating surfaces.
- Heat the cylinder head evenly to approximately 150-180 degrees C to expand the guide bores.
- Press out the old valve guides using a proper guide driver and hydraulic press.
- With the head still warm, press the new SPTGDE-NVQ35-12 guides in to the correct installed height using the appropriate driver.
- Allow the head to cool to room temperature.
- Ream the new guides to the correct stem-to-guide clearance as specified by your engine builder.
- Verify clearance with a dial bore gauge before proceeding with valve installation.
- Install valves, springs, retainers, and seals per standard head assembly procedure.
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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