There is also some free-hand engraving on the top of the crankcase breather cover with a date of "12-21-89" (the year isn't very legible, but that is most likely what it says judging from the "12-21" part that is legible), one day earlier than the stamped date.
Oil pan suction tube date, it's on the surface just under the metal netting. This picture was hard to take because the camera kept wanting to focus on the netting, not on the surface below it.
Possible cast-in dates on the cylinder heads. Maybe that symbol thing with the numbers in the middle in front of the "89" is part of the date code?
Driver's side head, there is a "V6" stamped on this head.
Passenger side head.
