ARP's Toyota JZ-Series cylinder head stud kit replaces the factory head bolts with undercut, 12-point nut studs machined from chromoly steel and finished in black oxide for reliable clamping under high cylinder pressure.
Specifications:
- 12-Point Nuts
- Chromoly Steel
- Black Oxide Finish
- Undercut Threads
Applications:
- Toyota JZ-Series
FAQ
What does this head stud kit include?
Chromoly cylinder head studs with 12-point nuts for the Toyota JZ-Series engine.
Are the studs undercut?
Yes, the studs feature undercut threads to reduce stress concentration and improve fatigue strength.
What material and finish are the studs?
They are machined from chromoly steel and finished in black oxide for corrosion resistance.
What nut style is included?
The kit uses 12-point nuts for precise, repeatable torque.

