Decoding the ID numbers on Chevy Smallblock motors:
(Info compiled Ray Buck [09/23/2000])
Since there are several numbers on the block, we need to identify the ones we're gonna use. The first one I usually use is the block casting number which is located at the back of the driver's side cylinder head and will look something like: 3970010.

The other number is the block stamping ID which is (kinda like the name implies) stamped into a machined pad at the front of the passenger side cylinder head. It'll look something like V0322CMK.

Once you have these 2 numbers, go here:

Decode the block casting number first to get the general information and then decode the stamping ID to get the specific application information.

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