There are many important reasons to use ARP Pro Series head stud kits for your Toyota 1ZZ-FE engine build, including the USA Made 8740 Chromoly Steel studs, with 180,000 psi rating for an increased cylinder head seal. All kits come complete with hardened parallel-ground washers and high quality fasteners.
- Manufactured from 8740 chrome moly steel
- Heat-treated in-house to 180,000 psi tensile strength
- Precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others.
- USA Made