Product Kits

ARP Custom Age 625 Head Stud & Cosworth Head Gasket Performance Package | Mitsubishi Lancer Evolution X

  • Sale
  • $577.83
  • Regular price $916.89

Evo X Head Studs and Gasket

ARP's Custom Age 625 Plus material is newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness - with complete resistance to atmospheric corrosion and oxidation.

Building a high performance engine requires quality in every component chosen. Cosworth head gaskets are precision engineered and feature a folded stopper layer which provides superior and clamping force around each cylinder resulting in a more reliable and true seal. Manufactured using individual die cut layers of stainless steel to ensure consistently smooth edges to our standard of +/-0.001in dimensional tolerance then pre-coated with a 0.25 micron layer of rubber creates an immaculate gasket capable of extreme pressures and conditions.


  • Head Stud Yield Strength: 235-255,000 PSI
  • Head Stud Tensile Strength: 260,000 PSI
  • Head Gasket Bore Sizes: 87mm , 88mm, 90mm
  • Head Gasket Thicknesses: 1.1mm, 1.3mm

Recognizing Head Stud Failures


  • 2008-2015 Mitsubishi Evo X

What's in the box?

  • ARP Custom Age 625+ Cylinder Head Stud Kit 207-4207
  • Cosworth High Performance Head Gasket


  • ARP: Manufacturer Standard Warranty
  • Cosworth: No Warranty