For applications where you have turned the boost right up over 30psi and plan to keep the head from lifting. This is the first thing that occurs from testing when pushing the limits.

These H13 tool steel headstuds are manufactured much stronger than the typical 8740 chromoly.

Conventional washers are only 23-24mm OD, whereas these new oversize washers are designed to encompass the entire head bolt boss. CNC machined from 4140 chrome moly bar stock, hardened to HRC 45 and blackened for appearance.

FEATURES :

  • The dogpoint feature seats the stud in the blockand preloads the fastener for a more accurate and repeatable torque sequence.
  • Including the ARP ultra torque assembly lube with each set. When it comes to headstud perfmance properly torquing the studs is paramount and we have made every effort to ensure torque precision and repeatability.
  • Direct OEM replacement, no modifications.
  • Made in Australia, beware of cheap immitations!
  • Instructions are included.
Brand Powertune Australia