I think i have been adding coolant for more than 4 years to my Ford because it had a leak out the back off one head. The last 3 summers i add water thinking that winter i would fix it then winter came and i had to refill with antifreeze. Sunday i got the shop cleaned out it fit with room to spare. It has one of those engines that there is no way to tell what size it is until its apart. I got one head off tonight and its a 330 if i force my self i could have it back together buy the weekend.