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Hello, yes t hat sounds about right, a lifter could be bleeding down. Best thing to do would be to remove the valve cover and run the engine to isolate the area of the noise, which will be messy but know exactly what area of the right side of the valve train is causing the issue. take a good look at the camshaft lobes. I have seen even with low mileage pitting in the cam lobe that has caused some engine noise as the rocker rolls against the bad spot. Sometimes if the engine sits a while it will build up varnish in the valve guides and cause the valve to hang and actually spit a rocker arm out(if its been sitting a long time). So take a good look at all the cam lobes and rockers. If no signs of damage. Pop off a cam cap and inspect for any wear, should be a smooth surface, if any ridges or lines in the cam journal to the head, the camshaft would need replacing
Yup, Ive seen all sorts of things regardless of miles. I just got done replacing a crankshaft in a 2001 Excursion V10 with 123k miles for two main bearing s wiped out and spun but ran fine otherwise.So pay close attention to detail when the valve cover is removed
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No problem, wasnt sure if you dove into it or not and its pretty basic engine stuff, just inspect everything and check for any wear or defects.