Tried to find it in the summit on line catalogue. I know it's there, but where!!! (Oh for the days of fat paper catalogues!!!) The Edelbrock numbers are 8003 for 1/4 inch rods and 8004 for 5/16 inch rods. I think I bought my first one in 1976 and ditched the bolt in the slot rig I was using on my 4bbl 318.
