OK... just tried Martin's aluminum foil trick and pictures and results as follows: The 54 AD radiator configuration was slightly different than my 52... the top of my radiator was roughly even with the top of my radiator frame. In the 54, the top of the radiator stuck up above the top of the radiator frame by maybe 1 inch. No matter how you cut it, the results of the aluminum foil test yielded at least 6 inched from the top rail of the radiator frame and at least 5 inches from the top of the radiator. To be conservative, when I talk to radiator manufacturers, I will assert that I have no more than 4.5 inches above my current top bar on my radiator frame into which to grow the radiator vertically. All this just made my subscription to Stovebolters worth it!!!! Many Thanks, all.
