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One thing you can do which is extremely effective is get a long handled screw driver and poke it on to bits around where you think it might be - rocker covers, cylinders (underneath), heads, underneath, AC compressor, whatever.
I bet you fairly quickly narrow the source down - to an individual rocker/cylinder/whatever.
You stick your ear to the other end of s driver - the handle bit - not the pointy bit.
Alan
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