My car has been silent the past six months while I replaced the head gasket plus some other work. Yesterday and today I fired the car up and gave the car some exercise. To my dismay there's a definite and distinct valve tick (just one) that will not go away. It was NOT there before I replaced the head gasket. No other work was done to the head (not enough miles). Oil pressure is good and normal. I'm sure the noise isn't an exhaust leak.

What do I do now? The noise is embarassing on an otherwise fine running car.

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95 E320 Cabriolet, 159K