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My project includes 964 cylinders and the tins pictured, they fit "factory". The 964 and 993 have an additional fan on the front of the alternator, probably to aid alternator cooling, along with its own little shroud, but no directional vanes. The curved part makes sure that the undersides of the cylinders get airflow along them, otherwise they would practically be without cooling air, this is also the only part of the 964 cylinder that actually has cooling fins on it.
Brian
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