Maybe someone can help me out with this. In looking at the head of my TR3 there is a core plug on the right side center. There is a casting mark(old) but also stamped in the plug are two large S's. Is anyone familiar with this? I'm kind of hoping it means that it;s been converted for no lead. Any info would help they do not seem to be original. Thanks Satch
Who would have thought this would be tougher than building an antique harley?