ARP Starter Bolt Kits 430-3515. Starter Bolts, Stainless Steel, Polished, 12-point Head, 3/8-16 in. Thread, 1.750 in. /4.400 in. Underhead Length, Chevy, Pair. Simplify the installation of the starter in your race car with these Custom 450 stainless steel starter bolt kits from ARP.