ARP L19 Head Stud Kit – Mitsubishi 4G63 7-Bolt | Lancer Evolution VIII/IX / DSM

Build with confidence on your high-output Mitsubishi 4G63 7-bolt engine with the ARP L19 Head Stud Kit — ARP's highest-strength head stud solution for the 4G63 platform. The factory head bolts and even ARP2000 studs can become the limiting factor on heavily modified 4G63 builds running high boost and aggressive power levels. ARP's L19 material exceeds 200,000 PSI tensile strength — the strongest material in ARP's lineup — providing maximum clamping force and fatigue resistance to keep your head gasket sealed under the most demanding conditions. 7-bolt 4G63 applications only — covers the Lancer Evolution VIII/IX (CT9A) and DSM 7-bolt platforms.

Key Features

• ARP L19 Material – 200,000+ PSI Tensile Strength: ARP's highest-strength stud alloy — exceeds 200,000 PSI tensile strength, significantly stronger than ARP2000 and factory head bolts. The preferred choice for high-boost, high-output 4G63 builds where maximum clamping force and fatigue resistance are critical
• 7-Bolt 4G63 Specific: Engineered specifically for the 7-bolt 4G63 head stud configuration — covers the Mitsubishi Lancer Evolution VIII/IX (CT9A) and DSM 7-bolt applications (Eclipse GSX, Talon TSi AWD, Galant VR-4)
• Complete Head Stud Kit: Full kit includes all studs, nuts, and washers required for a complete head stud installation on the 4G63 7-bolt engine
• Prevents Head Gasket Failure: Superior clamping force over factory bolts and ARP2000 studs keeps the head gasket sealed under high boost and extreme cylinder pressures — critical for preventing head gasket failure on modified 4G63 builds
• ARP Quality: Manufactured by ARP (Automotive Racing Products) — the globally recognized standard in high-performance engine fasteners trusted by professional engine builders and racing teams worldwide

Specifications

• Type: Head Stud Kit (Complete)
• Material: L19 (200,000+ PSI Tensile Strength)
• Configuration: 7-Bolt
• Engine: Mitsubishi 4G63 7-Bolt
• Fitment: Lancer Evolution VIII/IX (CT9A) / DSM 7-Bolt (Eclipse GSX, Talon TSi AWD, Galant VR-4)
• Part Number: L19-7B

⚠️ 7-Bolt Only: This kit is for the 7-bolt 4G63 only — it is NOT compatible with the earlier 6-bolt 4G63 found in 1st-gen DSM and early Evo applications. Verify your engine's bolt count before ordering.

Installation Note: L19 material requires careful handling — do not use an impact wrench during installation. Use ARP Ultra-Torque assembly lubricant (sold separately) and torque to ARP's specified value for the 4G63 application. A proper head gasket and freshly resurfaced head and block deck are strongly recommended when installing head studs. Professional engine building by an experienced machinist is strongly recommended.