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Head Stud Kit

ARP head studs provide superior cylinder head clamping and reduced distortion and should be considered essential for every performance engine build. The manufacturing process involves centerless grinding of the blanks for near perfect concentricity and thread rolling after the heat treatment for significantly increased fatigue strength. 8740 Chromoly material has a 200ksi tensile strength and Custom Age 625+ is 260ksi.

Special order.

Manufacturer: ARP

Applications:

  • Nissan 350Z/370Z
  • Nissan GT-R

What is the advantage of head studs over head bolts? A properly installed head stud will provide more accurate and consistent clamping force which will improve head gasket reliability. A head bolt will twist as it is being torqued meaning that only a portion of the torque loading will be in the vertical direction.

When is it necessary to use a Custom Age 625+ head stud kit over the standard ARP 2000? The higher tensile and yield strengths of Custom Age 625+ allows the use of increased torque values to improve the head clamping force. Extreme applications which are prone to head gasket issues will benefit from the high strength studs. The higher forces at the block will result in increased cylinder distortion which will need to be corrected.