Hi there, thank you for the donation,
With out hearing the noise it is a bit hard to say one way or the other, but the oil pressure readings you report sound fine, you may have stressed a lifter or even bent a push rod, you can do a valve lift test to check a push rod, but I would be thinking more on the lines of a lifter, you could start with an oil flush using a good quality flushing compound just in case it is some loose carbon fouling a lifter, otherwise it is the head off to check lifters.
Mark (mhpautos)
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Saturday, November 21st, 2009 AT 6:23 PM