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. 7173LT

    7173LT Member

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    Mar 21, 2017
    TWOZS..
    Sooo, if my cowl tag says 08E for the build date, but is stamped 71 on the cowl tag, what year engine casting am I looking for? close to 70? or 71? McCune says the car was built in 71, Gary says that a 70 engine is what would have been in it. Heres more food for thought.. The original Muncie (with matching vin stamp on it) is stamped with a P1K27A. Tell me if that tranny stamp makes any sense. Long story short, Im searching for a block and heads and going to do a correct restamp and am not going to hunt for a counter exchange block and need to know what belongs. Cast date on the rear if I remember is a 71 also.
    Any help would be appreciated.
     
  2. McCune

    McCune Veteran Member

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    Aug 22, 2015
    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.
     
  3. 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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  4. 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
     
  5. 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.
     
  6. 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.
     
  7. 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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  8. 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
     
  9. 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.
     
  10. 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 .
     

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