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Found 09/03 manufacture date but having a bit of trouble establishing engine build date.
Checked the valve cover(s) - found only International Engine ID sticker with general engine data and couple of bar code stickers providing no clear date informated
I found mine on the egine sticker toward the back of the valve cover on driver side. I had to get a step stool, flashlight, twist my neck, use my eyes like a chamelion, but it's there.
Easier way is to run your vin with the dealer service departement..