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You can turn almost all the cranks as long as the material needed to remove is within an undersize bearing set. Most parts suppliers list .010, .020, and .030 . Like CorseChris mentioned, make sure that you can get actually get the under size bearing before having the crank turned. Last time I checked, availability was almost non-existent in many undersizes.

You might have a problem re-nitrating the crank. I could not find a machine shop that was willing re-harden the crank after-wards. The heat introduced into crank with the grinding process, and then re-nitrating requires the crank to be straightened. Since most cranks in other marques are not nitrated and Alfa only started nitrating cranks with the 2000, I would not let that stop me in using a reground crank.
 
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