when i took this pic of an American Arco Radiator, I though it was obvious but about 2 and half inches up the leg the casting flares and i'm thinking that is indicative of where one might begin to suspect the internal cast passage begins. I need to cut about 7/8 inch off the legs after a floor replacement. i got called in after and the valve is right up against a wall and it goes literally into a brick center wall in the basement so i can't access either end of the 1 and a 1/4 valve nipple to heat it to possible put in a longer one or add an extension and there is zero play/lift on the pipe. the valve is actually working and i think cutting the legs of the rad seems the most expedient so just looking for any knowledge on internal geometry.
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