where is the serial number on the motor for a 2001 Sebring, 2.7 3.0 V6
White sticker on valve cover, and rear edge of bell housing or block
If you are need info on the engine that goes in it the Vin is your best bet, upgrades (engine) forums and write ups.
Search Chrysler Sebring Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chrysler Sebring Experts