Running with limited lubrication and high heat long enough to discolor the entire counterweight means that the metallurgy of the shaft could have changed. Cast iron and even forged steel has a tendency to get hard and brittle when it's heated enough to change color after it cools. Stovebolt crankshafts aren't that scarce- - - -yet- - - -so if there's any question about its suitability, I'd try to find one that hasn't been subjected to the stress this one has obviously experienced. A good machinist's hands-on examination is your best bet here. We can make an educated guess based on the pictures, but nothing beats getting the input of someone with the ability to do a hands-on inspection.

Here's an example of one that would be a better choice, even if it needs a regrind:

http://cgi.ebay.com/ebaymotors/1954...arts_Accessories&hash=item3cbb5951eb

Quite often, a "crankshaft kit" with a reground crank and the appropriate bearings are available from machine shops that do crank grinding, and they will take your used shaft as an exchange item.
Jerry


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