What material are the ARP head studs made from?

The studs are made from ARP's proprietary 8740 chromoly steel. This material is heat-treated to achieve a tensile strength of 200,000 psi.

Does this kit include everything needed for installation?

Yes, the kit comes complete with the head studs, 12-point nuts, and hardened parallel washers required for installation.

Why should I use head studs instead of stock bolts?

ARP head studs provide a stronger clamping force than stock head bolts. This helps ensure a more reliable seal for your head gaskets, which is important if you're running higher boost or compression.

ARP

ARP Mazda 2.5L (KL Series) V6 Head Stud Kit

Name: ARP Mazda 2.5L (KL Series) V6 Head Stud Kit
Brand: ARP
Price: 316.38 USD
Availability: InStock

$316.38

ARP head stud kit for Mazda 2.5L V6 KL Series engines. Stronger than stock bolts for improved head gasket sealing.

Key Features

ARP 8740 chromoly steel construction — rated to 200,000 psi tensile strength.
12-point nuts and hardened parallel washers included — ensures even clamping force.
Improved head gasket sealing — helps prevent leaks under high stress.
Direct replacement for stock head bolts — designed for a proper fit.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more