B18C1 ARP Main Studs (Pre-Order)
ARP's Main Studs offer a few advantages over both OEM and main bolts. Studs are recommended over bolts due to the ability to obtain more accurate torque readings because studs don’t “twist” into the block. Also, elimination of main cap walk and fretting, as well as precise alignment of caps.
1/2 12pt, 3/16 Allen
Part # 208-5403