Ford BA/BF/FG Barra engines.

Arp are the leading brand in fastener technology. All fasteners are made with the highest quality materials with quality assurance testing. 

The studs are manufactured from 8740 chrome moly steel, heat-treated at ARP to 190,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 2000% stronger than others.

8740: 8740 chrome moly is seen as a good tough steel, with adequate fatigue properties for most racing applications, only if the threads are rolled after heat-treatment, as is ARP's standard procedure. Chrome moly can be heat-treated to deliver tensile strengths between 180,000 and 200,000 psi.