It appears they have some water but I don't know how to tell a 1/2 water head. They look like KB heads as originally designed from the late 70's. 16 bolt intake and D-port exhaust. Later they also made them with 10 bolt intake. Mine has rectangle exhaust. I assume later they made some solid. And probably other variations also. I like 'em. But wow what a project. They don't even have the steel inserts for the head bolts or the head stud inserts. I don't know where to get those inserts for the head bolts but hopefully they are something standard. You asked about value. There's probably some fruitcake like me that would give $2,000 just because he likes 'em. But I can tell you the last time I sent a head like that to the shop for work the bill was shocking. Positively shocking. Thanks for sharing them with us. I think that's all I know about them.