70 Z28 - Are these smog tubes any good

Discussion in 'Original Drivetrain Topic' started by COPO, Mar 9, 2010.

  1. Eric winkel

    Eric winkel New Member

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    Check valves look to be original, should I replace or wait to see if any good after startup?
     
  2. COPO

    COPO Veteran Member Lifetime Gold Member

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    If your pump is functional then the pipes will be warm. If the pump was deveined but spins then the pipes will be as hot as the exhaust manifold.
     
  3. COPO

    COPO Veteran Member Lifetime Gold Member

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    Check them by blowing air into them with your mouth. If working then air only moves in one direction.
     
  4. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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  5. Eric winkel

    Eric winkel New Member

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    I still have to find the correct pump/pulley/diverter so trying to keep costs somewhat in line. RH manifold is not correct but best I could find for the $....thank you for all the advice & replies
     
  6. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    I fully understand the costs issue. Based on this, I would pretty much give up on the pulley. Original deep groove smog pulleys alone go for ~500 or so. There is a reasonable repop available for a tenth of that.
     
  7. Eric winkel

    Eric winkel New Member

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    My other four deep groove pulleys are original so kinda like to complete the set. Found a '69 pump locally with white fan, spacer & 234 pulley but he wants $1k and it will need to be rebuilt...ugh
     
  8. secondgenaddict

    secondgenaddict Veteran Member

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    IMHO 1k for a pump needing a rebuilt - without the correct pulley or diverter valve is high.
    The 234 pulley is not correct for a Camaro as far as I know. The 234 with pie crust back is the 69-70 L46 Corvette and 70-72 Corvette LT1 pulley. The 234AL without pie crust back is the 1973-1974 Corvette HP L82 smog pulley.
    The spacer 3/4" steel is used with the corvette through at least 74 - later in the 70's they went to an Aluminum spacer.
    The 458 with stamped part number is the 69-72 Camaro Nova Chevelle HP pulley.
    The 458 with the inked part number is the 1973-1974 part also used on some corvettes of the same era-73 newer.
     
  9. COPO

    COPO Veteran Member Lifetime Gold Member

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    Correct pulley for a 70 Z28.
    [​IMG]
     
  10. Eric winkel

    Eric winkel New Member

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    That's the pulley I wound up getting. Just have to find a 330 manifold and an LT1 rh smog tube and I'll be all set
     

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