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i suggest use a screwdriver and listen like you would with a stethoscope to locate exactly where the sound is...eg listen to injector directly, maybe pull the valve cover off and inspect everything for tightness, missing parts, maybe even spray some ether around to ensure no leaks...my injectors have a fast click like you describe...usually a rod/crank bearing going is a slow sound as are rocker arms if it was a head issue...
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