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ARP BMC B Series 5-Main Main Stud Kit - arp206-5403 missing-image Mufflers & Tips::Catback 2007-2008 Chevrolet*Main Studs* There are many important reasons to use ARP main stud kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block. All kits come complete with hardened parallel ground washers and high quality nuts. Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in