Freezerburn,
On the very next page of these BIg Bolt posts is a very detailed discussion of exactly this issue: The RH5 rims aka Widowmakers and exactly how to identify
them. It goes on for several pages and with the expertise you'll find about everything here you will find what you need to know, plus guys post pics!
Good Luck. I learned the most, and just bookmarked for future reference, many
sites and tips that were referenced in these posts. I could darn near publish a book on 1946 6400s at this point. Unfortunately, today is a day to go cut firewood. If I get done soon enough I will finish taking the head off my 235. It seems that mud wasps built a colony all through the carb, manifold, and into the cylinders! A great show for the Nature channel!
