Ok now don’t take this as Gospel till I have them in my hands, hopefully next week and I will try to update. On an Edelbrock head and I’m assuming a stock head the measurement between the center two exhaust ports (3-5 or 4-6) mounting bolts is 4 inches. This is the measurement for either holding the exhaust manifolds on or center header tubes. In my case I’m bolting W2 Hedman headers to an Edelbrock head. The plates he sent me measured 4 3/4 inches. I won’t post that number to help keep it from being confusing. The part number coming next week is (10220). I will update when I get them.
