Help with engine stamp

Discussion in 'VIN, Trim Tag & Drivetrain Decoding' started by Rattlecan, Oct 9, 2020.

  1. Rattlecan

    Rattlecan New Member

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    B9F13777-90D2-4891-A779-BDEBE92632F5.jpeg Hey everyone, I have an 86 IROC that’s had an engine swap. It’s got a 350 and I am able to decode the casting number 3970010, and can also decode the stamp on the passenger side front pad K0815CMJ as K-St. Catherine, Ontario then Aug 15th. What I can’t decode is my partial vin. there are NO LETTERS in it. It reads “161102109” can anyone help me with this number? Everything I see says a letter should be in the third spot but it’s DEFINITELY a number 1 stamped there and even if it was supposed to be an “I” there is no “I” plant code that I found. Someone please help me figure out what this engine is from. I have it narrowed down to a 1974 Police car.
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

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    The 1 indicates it was assembled at Oshawa, Canada. I don't have a listing for the cars made in Oshawa in 1976 (VIN indicates it is 1976), but in some of the previous years, they built B body full size cars and also A body (Chevelle). Usually, Chevy started VIN numbers for Chevelles at 600,000 and full size cars as 100,000. That tells me that it likely was from a full size car.
    If somebody can come up with the 1976 data for Oshawa, that could either confirm this or prove it wrong.
     
  3. Rattlecan

    Rattlecan New Member

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    FF121127-940B-46C9-AC97-9E6C7EEB4D99.jpeg
    see now I can sorta read it backwards as the last 6 being the production number, “1” for Canada and after that I’m confused because like you said “6” would indicate 1976 except that next to this the engine suffix is “CMJ” and that says it’s from an 1974 full size police car. I’m trying to figure out if it was an impala or caprice or what it was from. Also everything I find says the third character in the partial vin should be a letter but mine is all numbers.
     
    Last edited: Oct 9, 2020
  4. Gary S

    Gary S Administrator Lifetime Gold Member

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    Take a look at this page. GM lists most of their assembly plants by letter code, but when they needed more codes, they used numbers. The number 1 was used in the 70s for Oshawa, Canada.
    Yes, CMJ was used in 1974, but the VIN you list plainly has a 6 for 1976.
    http://www.angelfire.com/ca/TORONTO/VIN/generalmotors.html

    1=Chevrolet
    6=1976
    1=Oshawa
    102109=VIN sequence number (2,109th car off assembly line). Matches up with an August assembled motor.
     
  5. Rattlecan

    Rattlecan New Member

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    thank you so much for that! So maybe it was cast in 74 but wasn’t used until it was put in a 76 model car.
     
  6. Gary S

    Gary S Administrator Lifetime Gold Member

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    Last edited: Oct 10, 2020

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