Custom ARP 1/2" Head Stud kit, fits all EJ and FA engines

Custom ARP 1/2
  • Custom ARP 1/2
  • Custom ARP 1/2
  • Custom ARP 1/2


  • 25% stronger than 625+ studs and 40% stonger than 11mm ARP 2000's
  • reduced shank diameter (allows for no head gasket modifying) 
  • more thread engagement in block over 11mm studs
  • uses stock alignment pins without modifying case or heads
  • over 200ft/lbs tested for stud "pull-out" in block
  • same kit price compared to 625+ kits (requires additional block and head machining to use)
  • custom large diameter hardened washers to prevent embedding into head under heavy torque values and HP levels
  • Note, block machining must be performed as bare cases (can not be performed after shortblock is assembled)

In conjunction with ARP, Outfront Motorsports has an exclusive design with our specs and innovative design. Look for our markings, accept no imitations.