I have a 10410207 small block chevy crate engine in my '86 K5. I had the timing cover off and found "207", "201", "G11", and "X" cast in the block. A picture is attached. I have not had any luck decoding these castings. I already have the info on the 10410207 block but would appreciate knowing what the other codes mean. Anybody out there have a clue?

 

there should be a casting number right in front of where the alternator should be, or in front of the passenger side head facing upwards, should be a bunch of numbers followed by like 3 letters.

How to decode Chevy Engine Codes that site should tell you what it came out of

theres also another set of numbers back kinda by the distributor hole that tells you the date and plant it came from i think, been a while since i bothered with those