Evo 123 - ARP - 4G63 M12 Head Stud Kit
ARP M12 Head Stud Kit for the 4G63
A complete set of ARP 12mm head studs that clamp the cylinder head to the block far more consistently than the factory torque-to-yield head bolts. The result is a stronger, more reliable head gasket seal that holds up to elevated boost and cylinder pressure.
Specifications
- Material: ARP premium grade 8740 chromoly steel, cold forged and heat treated, with black oxide finish
- Tensile strength: 200,000 psi
- Stud size: 12mm (M12) studs
- Includes: Studs, hardened parallel washers for even load distribution and accurate torque readings, nuts, and ARP assembly lubricant
Why it matters on your Evo 1-3
The boosted 4G63T builds serious cylinder pressure, and the stock torque-to-yield head bolts stretch and lose clamping load over time. Once you raise boost the factory hardware is a common cause of head gasket failure and head lift. ARP studs let you torque to a precise, repeatable clamp load so the head stays sealed, making this one of the first upgrades for any reliable turbo 4G63 build.
Fitment
Mitsubishi Lancer Evolution I, II and III (CD9A / CE9A), 1992 to 1995. 7-bolt 4G63T 2.0L turbo. Also fits other 7-bolt 4G63 applications.
