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Premium L19 Clamping Force for the 7-Bolt 4G63
This is the ARP L19 head stud kit engineered for the 7-bolt Mitsubishi 4G63 engine found in the Evolution IV through IX and DSM-platform Eclipse GST/GSX and Eagle Talon TSi. Built from ARP's premium L19 alloy, comparable to A1 Technologies H11 tool steel, this kit exceeds the clamping capability of standard ARP2000 studs for high-boost, high-horsepower 4G63 builds.
Key Features
- L19 alloy delivers a yield strength of 200,000 to 230,000 psi and a tensile strength of 260,000 psi.
- Full replacement set of 10 studs sized for the 11mm (7/16in) 7-bolt 4G63 block.
- Includes 8740 chromoly washers, 8740 chromoly 12-point nuts, and ARP Ultra-Torque assembly lubricant.
- Higher strength than standard ARP2000 studs for high-boost and high-horsepower applications.
Fitment
| Year | Make | Model |
|---|---|---|
| 1996-2006 | Mitsubishi | Lancer Evolution |
| 1992-1999 | Eagle | Talon |
| 1992-1999 | Mitsubishi | Eclipse |
Specifications
| Detail | Value |
|---|---|
| Brand | ARP |
| Engine Application | 7-Bolt Mitsubishi 4G63 |
| Material | L19 alloy |
| Tensile Strength | 260,000 psi |
| Yield Strength | 200,000 to 230,000 psi |
| Stud Size | 11mm (7/16in) |
| Quantity | 10 studs |
What's Included
- 10 L19 head studs
- 10 8740 chromoly parallel-ground washers
- 10 8740 chromoly 12-point nuts
- 1 tube of ARP Ultra-Torque fastener assembly lubricant
About ARP
ARP (Automotive Racing Products) manufactures premium fasteners for engine builders, and its L19 alloy is reserved for the highest clamping-force applications on engines like the turbocharged 4G63 where standard ARP2000 studs reach their limit.
FAQ
What engines does this head stud kit fit?
The 7-bolt Mitsubishi 4G63 turbo engine used in the Evolution IV through IX, Eagle Talon TSi, and Mitsubishi Eclipse GST/GSX.
What is included in the kit?
10 L19 studs, 10 8740 chromoly parallel-ground washers, 10 8740 chromoly 12-point nuts, and a tube of ARP Ultra-Torque assembly lubricant.
How is L19 different from standard ARP2000 head studs?
L19 is a higher-strength alloy comparable to H11 tool steel, with a tensile strength of 260,000 psi versus roughly 220,000 psi for standard ARP2000, making it better suited to high-boost or high-horsepower builds.
Do I need to handle these studs with gloves?
Yes. ARP recommends handling L19 studs with gloves and keeping them well-oiled, since the material is prone to hydrogen embrittlement and stress corrosion from moisture and skin contact.
What size are the 7-bolt studs?
11mm, or 7/16in.
Does this kit fit the 6-bolt 4G63 as well?
No, this kit is specific to the 7-bolt 4G63 block. A separate kit is required for 6-bolt applications.
Is a new head gasket required with this kit?
Yes, ARP recommends installing a new head gasket any time the cylinder head is removed for stud replacement. This kit includes studs and hardware only.
What is the recommended torque procedure?
Follow ARP's published torque specification for this kit, applying Ultra-Torque lubricant and torquing in progressive stages per the instructions included with the kit.
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, wearing gloves and keeping the studs well-oiled throughout handling.
- Install a new head gasket and set the cylinder head in place over the studs.
- Install the 8740 chromoly washers and 12-point nuts, applying ARP Ultra-Torque lubricant as directed.
- Torque the nuts in the progressive stages specified in ARP's instructions included with the kit.
- Recheck torque after the engine has completed a full heat cycle, per ARP's general guidance.
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