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metallic tapping that becomes faster as the engine speed increases indicates valve tapping. one or more of your valves clearances are misadjusted. to help you find out which one it is cut a small section of hose, put one end to your ear and place the other end on different spots along the rocker arm cover, where the sound is loudest is where the problem valve is. purchase a repair manual for your car for valve clearances and specific valve adjustment procedures.

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