Working on my 1973 340, any valve stem seal replacement preferences, Umbrella vs. Positive style. Seems the positive style would be better than the umbrella as the positive would wipe the valve rather than just shielding it from oil. Thoughts appreciated. Oh, i looked around in the archives and didn't come up with anything. Maybe it's me but i can never find anything in the search.

Working on my 1973 340, any valve stem seal replacement preferences, Umbrella vs. Positive style. Seems the positive style would be better than the umbrella as the positive would wipe the valve rather than just shielding it from oil. Thoughts appreciated. Oh, i looked around in the archives and didn't come up with anything. Maybe it's me but i can never find anything in the search.