i had a similar problem over the summer... i couldn't find the problem for the life of me... it sounded like a rocker, but they were fine when i checked them... it always sounded like it came from the #4 cyl... couldn't find it anyplace so we checked #3 nothing... finally i just checked the alternator... bingo... the bearings were bad... it seems that the cast bracket used on my stang to hold the alternator and air pump in was transmitting the very very quiet sound into my passenger side valve cover, acting like an amplifier (like a bell does) i was pretty embarassed about it, but i guess its pretty common with aftermarket valve covers, since they are usually thinner than stock so they transmit sound differently... hope this helps...
Phantom
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