I have looked at all of the stuff in the tech section, and I've gone through all of my service manual collection, and all of my Motors, and Chilton manuals, and I'm stumped. I need to find the center to center length of a 401 rod. They give all sorts of arcane measurements, but not that. They give the length of straight 8 rods, but not the nailheads. Anybody got one they can measure? Thanks for the help,Doug