OK..I'did a search...really I did
But! I found conflicting evidence. One well respected member says that 3.2's did not come with sodium filled valves. I found that say they are..and I seem to recall that some 3.2's did have sodium filled exhaust valves, so didn't. The only way to tell is to look for a dimple on the fact of the valve...where sodium was poured, then the valve sealed.
So! What's the final word gang?