1970 Z28 engine questions

Discussion in 'Original Drivetrain Topic' started by gpm6367, Jul 13, 2019.

  1. Dave Nelson

    Dave Nelson Veteran Member

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    My new 70 Z/28 was ordered with 4.10 gears and turbo 400. That car was my daily driver before I took it off the street, at 60 MPH it was 3200 RPM'S with the stock tires.
     
  2. gpm6367

    gpm6367 Veteran Member Gold Member

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    I would imagine final gear in turbo 400 comparable to M 21 but those 4:10s are killers!
     
  3. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    Final gear on both are 1:1, but the 400 turbo has a bit of converter slip on the order of maybe 50 RPM or so.
     
  4. gpm6367

    gpm6367 Veteran Member Gold Member

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    92B363D8-96D7-486D-82D5-8DAC21639AA7.jpeg 7FC503B6-1029-4280-B521-DB45F43AB483.jpeg What a pain in the ass. Have most disconnected under hood. Next have to head under dash to disconnect all those lines... but it will be worth it.
     
  5. gpm6367

    gpm6367 Veteran Member Gold Member

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    F3E1886A-18D0-48FD-AEAC-F2D0C591074C.jpeg C1F1F62A-EE91-43F0-B808-945B3766BA50.jpeg 7092BCCF-8795-4177-BA35-45E11F603653.jpeg CDB0DEC2-32E5-4F93-B4AA-533BD3FB0B59.jpeg Well the engine bay is clear of all that extra AC clutter...yea...but a lot to do yet.

    I’m posting a few questions in the electric section if you think you can help answer some questions please check out that thread.

    I didn’t realize that the blower motor is on the evaporator under the dash so they made a block off plate on firewall. Damn, will I need to remove the inner wheel well to reinstall an original heater box?
     
  6. gpm6367

    gpm6367 Veteran Member Gold Member

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    67BC0CA4-4F35-4153-BFC4-AA9C9763886C.jpeg A7D0BFAF-69F8-4814-B025-59D0E97BD767.jpeg Is this hard plastic ductwork original to the car? They just drilled large holes to insert thief black flex hose?
     
  7. COPO

    COPO Veteran Member Lifetime Gold Member

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    You will need to open up but not remove the inner fender to do the heater core. I have to get mine recored and am holding off on the job.
     
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  8. gpm6367

    gpm6367 Veteran Member Gold Member

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    So drop inner fender down out of way?

    Isn’t heater core done from under dash?

    I’m going to temporarily loop the heater hose through block, eliminating heater core, so I can remove everything and car remains operational.
     
  9. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    Heater core comes out from the interior side.

    You have to drop, but not necessary to remove, the inner fender to access a couple of the screws above the fan area of the outer heater box. If we had another elbow in the middle of our forearms it may be possible....

    I wonder of the modded the firewall pad someway when they installed the VA unit.
     
  10. COPO

    COPO Veteran Member Lifetime Gold Member

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    I'm currently using the Dorman help 5/8-3/4 bypass.
    IMG_2401.jpg IMG_2399.jpg
     
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