Here is a rough guide if you know your serial #.
Quote:
Start of production thru 1425746 are Forged Rods
1425747 thru 1440712 are Powdered Rods
1446713 thru 1498318 are Forged Rods
1498319 thru final production run are all powdered
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*Beware* this is not 100% accurate, I check the # on my spare engine and it said it had PMR's. After I had the pan off I found it had forged. Also if you suspect it has a re-man in it they it wont mean a thing as the engine builder could have put anything in it.