Yep - the pad on the block just above the oil pan seal line. The Engine ID sticker on the cam cover is not worth much in the way of info. You nheed a VIN character definition diagram for your model year.
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Thanks for the info, my 97 deville had a new engine put in it back in 2003 by a GM dealer. The reason was because of cracked block I think. This was my dads car at the time and I was not involved in the situation. Fast forward to 2014. I am now the owner of the car and trying to learn about the Northstar engine. Unaware of common head gasket failer. Just curious as to what engine replacement was done. New 2003 Northstar engine or just a 97 replacement motor. By looking at the stamping on the motor might reveal what motor is presently in the car. I like the car but is scaring me from things I have read. Thank you.