Need to Find a 11/16 Bolt Coarse thread Mar 17, 2012 18:13:28 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Comet Cyclone on Mar 17, 2012 18:13:28 GMT -5 Need to Find a 11/16 Bolt Coarse threadAny ideas? I heard that some head bolts were 11/16? I Need this for my father's 31 Buick I have tap and die for it.