ARP Main Stud Kits
There are many important reasons to use ARP main stud kits, including the elimination of cap walk and fretting, as well as protecting the threads in your engine block. These studs are manufactured in our own facility using the best materials, processes, designs and engineering. Every ARP main stud kit exceeds the most stringent aerospace specifications. All kits come complete with hardened parallel ground washers and aerospace quality nuts. Some applications have provisions for mounting windage trays, and have specially designed stand-offs with serrated lock nuts to position the windage tray and lock it securely in place. The studs are manufactured from 8740 Chrome-Moly steel, and heat treated in house to 200,000 psi tensile strength, and precision J-Form threads rolled after heat treat to create a fastener that has threads 1000% stronger than others. Don't settle for anything less than the best! Insist on genuine ARP studs- you'll find our name stamped right on the end.
Studs Vs. Bolts
ARP recommends the use of main studs over bolts whenever possible for several key reasons. First is the ability to obtain more accurate torque readings because studs don't "twist' in the block. All clamping forces are on the same axis. By the same token, there is less force exerted on the block threads, which contributes to improved block life (very crucial on aluminum blocks). Finally there are factors of easier engine assembly and proper alignment of caps every time.
On any main stud application, Threads in block must be cleaned with a 'chasing' type of thread tap, studs must be loctited in block and torqued to ARP specs. (with proper ARP lubricant) before the loctite hardens. At this point the BLOCK MUST BE ALIGN HONED