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I believe that year had a one piece sealed breather box of aluminum, previous years had an open top that had a breather box bolted on. Your engine can be used with a 911 cooling shroud/fan, the breather must be machined off anyway.... You have rectangular exhaust ports also, harder to get exhaust for but popular in europe, they flow very well with good porting. Other than those 2 things they are the same.
ken
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