I am getting so close to finishing it makes me crazy, but as expected, it is the little things that jump out and slap me. Can anyone please tell me the stud thread, length and configuration I should have to bolt a two hole flange to the Thornton Cast Iron Headers? I see studs, washers and nuts and sometimes springs but I spent the better part of the afternoon looking at EBAY, Dorman, Walker, Summit, and Olds Parts places and cannot find anything that confirms the size I have and they sell are the same. I am assuming they are Grade 8? I need 4 Since mine will never be a show car, function is all I need not perfection.

 

Measure the holes for a general size. then measure how far apart they will be when assembled and add 3/4". Use Grade 5 and anti sieve on the threads.