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Valve Tapping Drivers Side When Engine Hot

Engine

Vehicle Information: Model: 911 Carrera; Year: 1986; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 58500;

Hello, Not familiar with normal engine operation sounds of the 3.2 so I thought I would add this brief question. The car was purchased with 58200 miles from a local Porsche dealer who adjusted the valves within 500 miles or so. Lately when the car is driven for a while I notice a slight tapping sound at idle coming from the engine on the drivers side. When you rev the engine to about 2000 RPM it kind of drowns out.Car runs great with plenty of power other than that. Any Input? Thanks in advance!

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