These Pro series studs from ARP are cold-forged to ensure molecular integrity. They are heat-treated prior to thread rolling and machining and are rated at a whopping 190,00 psi.
 
The pro series kits are also available with 12-point nut, and all kits come complete with hardened parallel washers for an even load distribution and accurate torque readings.
 
ARP Part Number - (203-4205)