While drinking way too many beers with the bro's the conversation turned to K-model harleys. A few more beers later the question of bolting the flat head jugs on a ironhead came up. Can this be done?

 

A straight fit? I don't think that is possible.
The crankcases are different as are the cylinder bolt holes.
That is not to say it cannot be done (I am sure someone has) but not practical for what it would cost.
See the evils of too much drinking?
pg