are you looking for the manufacturing Sequence number? The Head numbers or the block numbers? the Sequence number is located back by the transmission. the head numbers are stamped on the heads and often require the removal of the exhaust manifolds. the block number is often on the right side located around the center freeze plug. you can also pull the rear seat and look at the white sheet. This paper contains all the information about the assembly of the jeep. including the engine number and sequence number.
