Several thoughts come to mind:
(1) I need to find an impossible task that takes Jerry's fancy enough that he would make a trip to Lake of the Ozarks. Would be an honor and privilege to have him visit.
(2) I may be biased, but unless you are wishing to experiment, why bother with trying to remove this thing. As mentioned by Bart, if the fitting is stuck that badly, the casting probably has other issues. And while Rochester B's are not "a dime a dozen", they don't miss it far (scrap price is 45 cents/pound). Surely one could find a better core if one is truly in love with the B.
(3) While I rarely disagree with Jerry on a carburetor, I would suggest to someone who has not done this before that a toaster oven has better and more uniform heat control than a propane torch. Zinc alloy begins to "slump" at roughly 450 degrees F. VERY EASY to overheat a spot rendering the casting totally useless (except for 45 cents/pound).
Jon
