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Well I can't believe nobody answered your question! So I went to the manual and it says there is two. Driver's side. 1 Stamped on the backside of the driver's side head nearest the firewall. 2 Just below the driver's side head on the block right near the bell housing. They are either stamped in or on laser cut labels. Let me know if you find them.
I also cannot believe it either, and with over 50 people casting their eye's on this thread. But with your welcomed help, I will look tonight and see if I can find these numbers and let you know. Sounds like they are not going to be easy.