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If that's the only crack, or there's a few small ones like it, that's an easy repair for a specialist welder.  A little bit of filing and sanding afterwards, and it will be as good as new.  It'll probably be cheaper than some of the stupid prices I saw for crusty 2nd hand, often damaged, ones.  Fortunately, @MFX came to my rescue and sold me one for a sensible price.  What year is your SC?  You can buy new housings from Carpoint in Germany for $700 plus freight.  But if you have a 77/78 SC with a 226 mm fan, you'll need a new 245 mm hybrid impeller to go with the new housing. Another $500 (European Parts Service in the US of A).

Mine had cracks so big you could put a 5 cent piece in them, and the welder said he could fix it, but couldn't give me a quote.  Dress out the crack, preheat, weld, slow cool. Continue.  

Whatever you end up doing, check it for roundness, and don't over tighten the strap.

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I just had my alternator overhauled and in process a couple of small cracks in housing were noticed. It was sent off to repair/weld (not sure to who, unfortunately, as mechanic sent to someone they use for things like this).. cost = $210. 

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I actually came a cross a post on Pelican Forum recently that Brian from M&K Exhaust fame actually repairs them successfully and has done lots.  Having been impressed with the workmanship of their exhausts I would at least send Brian a email and photo for a quote. 

 

http://forums.pelicanparts.com/porsche-911-technical-forum/980667-fan-fan-housing-cracked-options.html

 

 

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