When they start smoking, you can use any additive you want, and it will still smoke. The best bet, is to go ahead and do the rebuild. But that is easy for me to say.
Correct me if I'm wrong Jesse..........I believe '81 and later Shovelheads got seals from the factory. TK.Speaking of 79's and smoke...does anyone know if they were coming from the factory with valve guide seals then?
Did any shovels have seals from the factory?