Remind Frank of Bob of The North's experience. He had to occasionally add water until his engine blew. He had it towed to Luke and a complete rebuild which I think included 2 heads. Jack
Just one head replaced but otherwise correct. We ran it for four years and it always used a little water. It would likely still be running that way except for the one day when I let it get low on water and it overheated. Its like a landmine waiting to get you when you least expect it.