21 Stud, How to tell the year

[Rowdy]

Thanks guys, will be loading the block up this am with a whole bunch of other flathead parts. Will get pic's of the block so I can better compare them when I get home. I do not remeber seeing a breather tube yesterday, but things like that can be overlooked if not looking for it. There was a crank close by that appeared to be cast.. If it is for this engine that will help narrow it down some more. Thanks Rod