Home › Forum › Ask A Member › 1957 McCulloch/Firestone 3.6hp boat motor
Can someone tell me what spark plug and gap that I will need for my 1957 McCulloch/Firestone Tire &Rubber 3.6hp boat motor? It is a model 133-7-1075.
The book says Champion H10J (H10C nowadays) or equivalent, gapped at .035.
Thank you for the information.