Any 70/71/72 Z28 owners? Engine date/stamp and cowl tag info needed.

Discussion in 'Original Drivetrain Topic' started by 7173LT, Dec 15, 2017.

  1. McCune

    McCune Veteran Member

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    st.george utah
    Sorry that I wasn't clear. Your car was built in 1970 but for the 1971 model year. So it is a early 71.
     
  2. 7173LT

    7173LT Member

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    Mar 21, 2017
    So guys, considering all of the above,, This car should have come from the factory with roughly a late July 010 block, correct? and which heads? 186s?
     
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  3. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    Beavercreek, Ohio, USA
    Probably good on the block and date, but not the heads. 186 heads were only 64cc chamber for high compression. For 71 they dropped compression by going to flat top pistons and 75 cc chambers with a casting number 3973487
    http://www.nastyz28.com/camaro/z28lt1.html
     
  4. twozs

    twozs Veteran Member

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    hopewell jct ny
    Probably early or mid August . GM wasn’t in the habit of letting money sit idle . My motor was assembled on a Thursday and was in the car assembly plant the next day . Obviously it’s farther from flint to Norwood than LA but still it’s pretty much non stop rail freight.
     
  5. Gary S

    Gary S Administrator Lifetime Gold Member

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    Bismarck, North Dakota
    P1K27A on the tranny sounds right for the car. The K indicates it was assembled in July which is what we would expect. The 1 in the VIN indicates it was destined to go into a 1971 model vehicle.
     
  6. 7173LT

    7173LT Member

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    Mar 21, 2017
    So you are saying that the July stamp on the trans is saying that the trans might have been assembled in 1970, but the "1" or 1971 on the trans was only showing what year car the tranny was going into, correct?
     
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  7. 7173LT

    7173LT Member

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    Mar 21, 2017
    And 487 heads with a `70 code would be correct for this car also? I thought they were a 71 only head. Did they cast 487 heads in 70`?
    Thanks
     
  8. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    Beavercreek, Ohio, USA
    Yes, they cast 487 heads in 70. Just like they cast 186 heads in 68 for 1969 model year cars.
     
  9. twozs

    twozs Veteran Member

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    hopewell jct ny
    its a built in 70 engine , but built to 71 specs .. it has to be .
     
  10. Gary S

    Gary S Administrator Lifetime Gold Member

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    Bismarck, North Dakota
    Correct. The '71s built before the end of 1970 would have components made in 1970. However, the tranny stamping shows the year model, not the year it was built. So, the P1K27A tranny was built on July 27, 1970 for a 1971 model car.

    In theory, during July, it would be possible to build a P1K27A tranny on the same day as a P0K27A tranny if the 1970 production had not fully stopped by that date and Chevy needed one more tranny to complete the 1970 car. That is theory, not reality. GM was more organized than that and you can bet they completed all parts for one year before starting on the new year so as to accomodate the year to year changes.
     

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