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1987 944S Cylinder head rebuild

Engine

Vehicle Information: Model(924/944/968): 944S; Year: 1987; Body Type: Coupe; Total Mileage: 119,000;

My 944S suffered the dreaded cam chain tensioner failure, so I am currently in the process of rebuilding the head and have several questions. Do the valve springs and lifters all need replacing? Can the springs be tested for strength? Any performance benefit to shaving the head? The timing belt was replaced 2000 miles ago - do I need a new belt? Finally, I've been told to obtain new head stud nuts - are they not reusable?

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