1973 RS,LT Z28 question body

Discussion in 'Body Restoration' started by Lou6t4gto, Dec 23, 2017.

  1. Rich Schmidt

    Rich Schmidt Veteran Member

    4,225
    32
    Mar 27, 2010
    Denville NJ
    I think the biggest reason GM didn't put A/C on solid lifter cars was because the compressor was in the way when adjusting the valves. GM recommended adjusting the valves once a year and having to remove the a/c belt and move the compressor and bracket out of the way would have been too labor intensive for routine maintenance.
     
  2. 70lt1z28

    70lt1z28 Veteran Member Gold Member

    2,326
    337
    Oct 3, 1999
    Beavercreek, Ohio, USA
    Possibly, but the story I have heard is that solid lifters were used for higher RPM's and the compressor wasn't able to take those RPM's.
    Witness the 1972 LT-1 Corvette. With AC (the only solid lifter engine that had AC) the tach was redlined at 5600 RPM. Without AC, it was redlined at 6500. No other changes to the engine.
     
  3. Ricks72Z28

    Ricks72Z28 Veteran Member Lifetime Gold Member

    964
    15
    Jan 1, 2005
    Schererville,In.46375
    Didn't the 70-72 Corvettes with the LT-1 have AC ?
     
  4. 70lt1z28

    70lt1z28 Veteran Member Gold Member

    2,326
    337
    Oct 3, 1999
    Beavercreek, Ohio, USA
    See post 12. ONLY 1972's had AC, and only a few hundred of them.
     
  5. 73LT/RS/Z28

    73LT/RS/Z28 New Member

    8
    0
    May 21, 2010
    Sandpoint,Idaho
    TheZ28 had a wide Stainless rocker molding, The Type LT was indeed painted black with about a 1" chrome molding just above the black that was exclusive to LT only. Lt's also had a narrow chrome strip along the belt line about half way up the door that was exclusive to LT's also. My LT/RS/Z28 had a damaged beltline molding on the driver door and I could never find and still need one. Mine is paint code 97 Med Orange Met. with a Muncie M-21 and all Z28's with man trans came with 373 gears but I agree with others above that 3.42's are probably optimum with a 3 spd. Auto. My 72 El Camino SS has a very modified 700R4, so because I have 4 spd and a torque converter clutch I run 373's with it.
     
  6. McCune

    McCune Veteran Member

    865
    129
    Aug 22, 2015
    st.george utah
    I thought the A/C cars had 3:42 ?
     
    twozs likes this.
  7. twozs

    twozs Veteran Member

    8,769
    154
    Aug 5, 1999
    hopewell jct ny
    As far as I know ( about the rear gear and ac Z28s ) . I’ve never checked mine . All M21s used the 3.73 . and belt molding is z21 style trim , a stand alone option
     
  8. twozs

    twozs Veteran Member

    8,769
    154
    Aug 5, 1999
    hopewell jct ny
  9. McCune

    McCune Veteran Member

    865
    129
    Aug 22, 2015
    st.george utah
    That is what I thought, 3:42 for AC cars with 4 speed. Thanks for posting Mike.
     
  10. secondgenaddict

    secondgenaddict Veteran Member

    248
    64
    Dec 29, 2012
    Upstate South Carolina
    65 L76 (327 365 solid lifter) Corvette was the first solid lifter car available with AC... the AC compressor was off to the side which gave a lot of room for the belt to wobble and SLING.
     

Share This Page