You have to look on the side of the block behind the starter. Use of a mirror and flashlight makes this an easier task to perform.
Every Chevrolet V-6 engine block has a metal plate attached to the engine block, listing the specifics of the engine. The casting numbers should be on the engine block plate.
The best way to identify your motor is to use the casting numbers on the drivers side rear of the block, behind the cylender head. The cylender head casting numbers may help too, they are located under the valve cover.
what does the casting number GM 3892657 say about this engine block
The block casting numbers are on the top driver side of the bellhousing flange at the back of the engine. The engine code is stamped into a pad on the block deck in front of the passenger side cylinder head.
Numbers on the motor of trucks and other vehicles are identification numbers for the engine block casting. These numbers identify the batch of production the engine block comes from and can be used in recalls.
They are sometimes called freeze plugs but in reality they are casting plugs. They are located on the side of the engine block.
Jeep 258 engine block casting number.
try behind the left cylinder head, on top of the block casting
they are casting plugs you will find them on each side of the engine block below the heads
MorTec.com has casting numbers and information
Under the valve cover where the valve springs are.
What engine casting number is 14010207