HELP

Relying on the VIN or any other off-engine document won't tell you a thing, other than what was there when it left the factory

There is also a stamped number under the driver side head front parting line on the top front of the block. It is a long number and I thing the first 4? contain the CID unless the engine was re-stamped by a rebuilder.

Other than that look on the side of the block for cast in numbers.