i dont believe they do. the reason i say studs is that everything in the bottom end is tty. so to do it properly you'd need to buy 2 sets of rod and main bolts. one for your plastigage and throw them away, then use the other set for final. it makes no sense to me. so if i were to ever EVER touch the bottom end on another 3800 i would get arp everything from the get go.