I always thought the lack of a seal there is to insure good electrical connection, the dist case needs to be ground
Bill
I would guess that a good ground should be achieved through the vacuum-advance clamp? However, oil/grease around the distributor might hamper a good ground of the distributor body/clamp. I know it is silly, but I have at times run a wire from a distributor-cap clamp-screw to the head (clutching a straws in dealing with high-rev misses).
