Engine identification

Discussion in 'VIN, Trim Tag & Drivetrain Decoding' started by Ibinyth, May 23, 2021.

  1. Ibinyth

    Ibinyth New Member

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    I believe I have a 350 I'll know more once I finish getting it out of my c10. The date stamp is pretty much gone but here's what I got. It's 3970010 block, not sure if it's a 2 or 4 bolt yet. Just trying to figure out what it was originally in.

    V10210NU
    10C125026

    The heads are 64cc
    3927186, not sure if they're original to the block.
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

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    I'm going to guess here that the suffix code is CNU, not ONU. I can't find any ONU coded engines.CNU would be a 350/250hp engine from a 1970 full size Chevy built at Southgate.
    However, if that is correct, then the 186 heads would not be original to that engine
     

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