Evo 123 - ARP - 4G63 M12 Head Stud Kit

ARP M12 head stud kit — 12mm cylinder head studs, 4G63

This is the 12mm (M12) stud version of ARP's 4G63 head stud kit, cold forged and heat treated from 8740 chromoly and finished in black oxide. It does the job the factory torque-to-yield bolts stop doing once an Evo 1/2/3 sees real boost: holding the cylinder head hard against the block while combustion pressure tries to push the two apart. Because a stud is clamped by a nut rather than twisted down into the block, you set a genuine, repeatable torque figure instead of hoping a stretched bolt still has something left. Check which stud diameter your build is set up for before ordering — this kit is the M12.

• ARP premium-grade 8740 chromoly steel, cold forged and heat treated, black oxide finish
• 200,000 psi tensile strength
• 12mm (M12) stud diameter
• Includes studs, hardened parallel washers for even load and accurate torque readings, nuts, and ARP assembly lubricant

Fits:

• Mitsubishi Lancer Evolution I (CD9A, 1992–1994)
• Mitsubishi Lancer Evolution II (CE9A, 1994–1995)
• Mitsubishi Lancer Evolution III (CE9A, 1995–1996)

ARP part #207-4701. Available to order; shipping shown at checkout.