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If you go to page 46 on here http://www.arp-bolts.com/catalog/catalog.html there is a big selection of rocker studs for BBC. Check to see which stud length "B" & thread length "D" best suit your application. Pick the stud that will give you the most non-threaded area inside the rocker pivot and still give you at least 7/16 thread engagement in the nut. Support girdles are a plus, just make sure the adjuster nuts you have will work with them.