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Re: 02 w/4.7 losing oil pressure.
if the lifters are making noise it is definately loosing oil press. did you change oil after head gasket. anti freeze will get into the crankcase and dilute the oil. possibly a bunch of crud fell into the crankcase. if so the oil pickup screen became plugged up. sounds like you may have to remove the oil pan and do some inspection. if all clean replace oil pump and hope for the best
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