I was wondering if these roller rockers fit on my GT40p heads without any modification the stud size is 5/16 in., They are Pedestal Mount. HERES A LINK
http://store.summitracing.com/partdetail.asp?part=CRN-44746-16
http://store.summitracing.com/partdetail.asp?part=CRN-44746-16