350 in my 400

Robskx250

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May 14, 2020
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1979 chevy k5 blazer
I recently purchased a 1979 k5 blazer that the vin identifies as having a 400 cid small block, however, the 3970010 engine stamp suggests otherwise. I need help identifying what engine is now in my truck. The #'s on the passenger side front of the block are V0712TZU and CBZ209846. Can anyone please help me identify this engine so I can order the right parts???
 
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