'70 Z28 - are these original calipers and rotors?

Discussion in '1970 - 1973 Specific' started by weim55, Mar 14, 2017.

  1. weim55

    weim55 Member

    Feb 23, 2017
    Is there a way to know if these are original calipers and rotors to this car?

    Rotor - 337220 K224 GM65
    LT Caliper - 12 5470125
    RT Caliper - 12 5470126

    Are rotors decoded the same way as engine components making the rotor date code for these units December 22, 1974?

    Steve weim55 Colorado

    Attached Files:

  2. Gary S

    Gary S Administrator Lifetime Gold Member

    Apr 14, 1999
    Bismarck, North Dakota
    '70 rotors should have a groove running around the surface of them. If the rotors have been cut undersize, the groove might no longer be there. But, that could mean they have been cut too far.
  3. 70lt1z28

    70lt1z28 Veteran Member Gold Member

    Oct 3, 1999
    Beavercreek, Ohio, USA
    Casting numbers on the calipers look right. Under the 12345, there is an e18"X", where I can't read the X. E 18 is I think for May 18. If the "X" is a 0, you may be good depending on when your car was assembled. Just guessing on some of these. Somebody educate me!
  4. Jay oconnor

    Jay oconnor New Member

    Mar 23, 2017
    Can someone help me with this issue? I just bought a 1957 Chevy truck with a camaro clip ,I want to put 2" dropped spindels but need to know what year the clip is the casting numbers on the spindle are 675 lh20 and 676rh16.thanks guys
  5. ronzz572

    ronzz572 Veteran Member Lifetime Gold Member

    Feb 8, 2007
    imperial pa
    If you trying to identify the frame and suspension year. The components you show look period correct for a 70 to 74 camaro with disc brakes. Everything is interchangeable. If the front top of the frame horns have 7/16 holes drilled and tapped out in them, The frames started getting those holes in 74 and up to 77 at least. Again most everything is interchangeable including dropped spindals.
  6. 2ndGenCrazy

    2ndGenCrazy Veteran Member

    Aug 18, 2011
    Upstate New York
    "K" may be October as I don't think castings used the letter "I" so as not confused with number "1". I know I have seen stampings with letter "M" for December as well. Others please chime in please on this. I would like to confirm that is correct.
  7. 2ndGenCrazy

    2ndGenCrazy Veteran Member

    Aug 18, 2011
    Upstate New York
    From what I have seen, calipers only have month and day. The characters to the left and right of E18 are the screw heads attaching date to mold and changed out each day castings are made.
  8. 2ndGenCrazy

    2ndGenCrazy Veteran Member

    Aug 18, 2011
    Upstate New York
    Date stamp located on outside vertical face of drivers frame rail near the rear edge.
  9. Bamaro

    Bamaro Veteran Member

    Dec 24, 2004
    Jacksonville, Md
    Yup, a circular grove in the center of the sweep area.

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