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1997 993 loud valve clicking at startup, then all was normal

Engine

Vehicle Information: Year: 1997; Body Type: Cabriolet; Total Mileage: 12,200;

Took the car out of a 60 degree heated garage after leaving it there for several months to get the required emissions test, and upon starting, heard a LOUD valve clicking. Let it idle for several minutes, sound diminished, drove at low RPM's until it reached operating temp, and all was normal thereafter.Is this normal, or did I risk any engine damage?Yes, no suprise, it passed the emissions test with flying colors. Thanks.

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