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My engine block numbers are C5F337147. I can't seem to find this number anywhere. I was told it was a 350. Was just trying to confirm and find out what year and what it might have come out of

  • Guess I should add it is currently in a 1971 Chevy c/k 20 – Johnny Jun 23 at 0:18
  • Welcome to Motor Vehicle Maintenance & Repair! That's not the block number ... look on the back left (driver's) side ... it should be a seven digit number starting with 39xxxxx. It will be casted into the block, not stamped. – Pᴀᴜʟsᴛᴇʀ2 Jun 23 at 1:29

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