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Higher Clamping Force for Built VQ35 Engines
This is the ARP L19 head stud kit for Nissan VQ35DE and VQ35HR engines, cross-referenced to ARP2000 kit 202-4701. It upgrades from ARP's standard ARP2000 alloy to ARP's premium L19 material, raising tensile strength to 260,000 psi and yield strength to 230,000 psi for high-horsepower builds that exceed the clamping capability of the standard kit.
Key Features
- L19 alloy delivers roughly 1,000 psi more clamping force than the standard ARP2000 202-4701 kit for this application.
- Direct drop-in replacement for the factory head studs with no block or cylinder head machining required.
- Documented in ARP applications supporting in excess of 1,400 rwhp on built VQ35 engines.
- Individually wax-paper wrapped by ARP to protect the L19 material from moisture prior to installation.
Fitment
| Year | Make | Model |
|---|---|---|
| 2003-2008 | Nissan | 350Z |
| 2003-2007 | Infiniti | G35 |
Specifications
| Detail | Value |
|---|---|
| Brand | ARP |
| Engine Application | VQ35DE / VQ35HR |
| Material | L19 alloy |
| Tensile Strength | 260,000 psi |
| Yield Strength | 230,000 psi |
| Torque Spec | 90-95 ft-lb in three progressive stages |
| Cross-Reference | ARP2000 kit 202-4701 |
What's Included
- Head studs
- Hardened parallel-ground washers
- 12-point nuts
About ARP
ARP (Automotive Racing Products) manufactures premium fasteners for engine builders, and its L19 alloy is reserved for the highest clamping-force applications where standard ARP2000 studs reach their limit.
FAQ
What is the difference between this L19 kit and the standard ARP2000 202-4701 kit?
Both fit the same VQ35 applications, but the L19 material has a higher tensile strength of 260,000 psi versus 220,000 psi for standard ARP2000, providing greater clamping force for high-horsepower builds.
Does installing this require machining the block or head?
No, this is a direct drop-in replacement for the factory head studs with no modification required.
What torque spec should I use for these studs?
ARP specifies 90-95 ft-lb applied in three progressive stages, higher than the roughly 65-70 ft-lb spec for standard ARP2000 studs in this application.
What engines does this fit?
VQ35DE and VQ35HR engines as found in the Nissan 350Z and Infiniti G35.
How much horsepower can this stud kit support?
ARP has documented L19 studs holding in excess of 1,400 rwhp in built VQ35 applications.
Why does ARP individually wrap L19 studs?
L19 alloy is more prone to hydrogen embrittlement and stress corrosion than standard chromoly, so ARP wraps each stud to protect it from moisture prior to installation.
Do I need new head gaskets when installing this kit?
Yes, ARP recommends replacing the head gasket any time the head is removed for stud replacement. This listing includes studs, washers, and nuts only.
How should I handle L19 studs during installation?
Keep them well-oiled and free of moisture contact throughout handling and installation, since the material is sensitive to corrosion.
Installation Instructions
- Remove the cylinder head and factory head bolts following the vehicle's factory service procedure.
- Clean and inspect the block threads and head stud holes before installing new studs.
- Thread each L19 stud into the block by hand, keeping the studs oiled throughout handling.
- Install a new head gasket and set the cylinder head in place over the studs.
- Install the hardened parallel-ground washers and 12-point nuts.
- Torque the nuts to 90-95 ft-lb in three progressive stages following ARP's published sequence.
- Recheck torque after the engine has completed a full heat cycle, per ARP's general guidance.
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