Thoughts on this block stamp?

Discussion in 'Original Drivetrain Topic' started by Rosster, Oct 3, 2021.

  1. DougD

    DougD Veteran Member

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    Yeas, broach marks are huge. I will try to blow it up and also get some other opinions and get back to this.
     
  2. l16pilot

    l16pilot Veteran Member Lifetime Gold Member

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    Hi Joe!...been a while bud. Hope all si good with you and the family :)
     
  3. flowjoe

    flowjoe Moderator Staff Member Lifetime Gold Member

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    Indeed it has been my good fellow! Trying to hang around a bit more.
    The family is good, I hope with yours as well.

    Good info with that stamp built so close to the OP’s. It’s not a great photo but I think the OP is right about the zero as well.
     
  4. Rosster

    Rosster Veteran Member Gold Member

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    Not sure. The guy selling it was also selling some add’l 186 heads saying the heads were never off the engine (until he pulled them) but the casting dates are 6 months apart and the valve retainers were aftermarket so his honesty is already questionable.
     
  5. THNDER

    THNDER Veteran Member Lifetime Gold Member

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    Looks bogus to me guys. They were gang stamped with engine code at Flint plant, so the down hill appearance is a red flag for me. The misaligned stamps were more common on the mid to late sixties engines, but it was the vin, not the engine code. Yenko site has some examples.
     
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  6. bkmont

    bkmont Veteran Member

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    Last edited: Oct 17, 2021
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  7. grumpyoldrat

    grumpyoldrat New Member

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    Looks suspicious to me but even if legit, it could be a 350 out of an Impala with the CTC suffix. No guarantee its an LT-1 engine.
     
  8. Gary S

    Gary S Administrator Lifetime Gold Member

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    I guess I'm a lot less suspicious than most people. It looks OK to me. The keyhole picture from the cellphone makes it difficult to see much. Isn't there a way to get cellphone pictures with a better aspect ratio to see better detail? If not, put the phone away and pull out a camera that can get you better pictures.

    I would look farther into the engine itself for a partial VIN, matching and correct heads and other parts. It these parts don't match up, then I would be suspicious.
     
  9. Patrick Modrell

    Patrick Modrell New Member

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    The CTC code is for 350ci, turbo hydro-matic, Z28 - CTB is code for 350ci, manual transmission, Z28 in 1970.
     
  10. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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