1970 z radiator help

Discussion in 'Original Drivetrain Topic' started by tcwcar, Feb 9, 2010.

  1. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    I've seen discussion about the "early" cars having AG and the "later" 70 cars having something different (no definition though of what that is).

    I'm not even sure what an early-late 70 car is. It seems loosely defined as around the July time frame.
     
  2. bkmont

    bkmont Veteran Member

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    What gets me is the single core used in the Z28 application. You would think that at least a double core would have been specified for the High Performance option.
     
  3. ronzz572

    ronzz572 Veteran Member Lifetime Gold Member

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    It is a 2 row core radiator. All 70 and 71 z28s received them. I don't know about the 72s. They could be 2 row cores also.
     
  4. Budz

    Budz Veteran Member Lifetime Gold Member

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    I guess if you wait and search long enough you don't need the Vasoline. My recent Ebay score. $299
    3.jpg 1.jpg 4.jpg 5.jpg
     
  5. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    Great find! Even has the tag. Bonus!
     
  6. bkmont

    bkmont Veteran Member

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    Good find. My LG radiator still has the original core and looks to be in similar condition as Budz newly acquired radiator. It has been tested by the local radiator shop. According to them, it checked out okay. The only problem is, when installed in my car it wants to run hotter than the replacement radiator. The replacement radiator temps stay around 180-190 year round. The original wants to run 190-220. It's the 220 that worries me. The 220 temp shows up in the middle of summer in stop and go traffic. I removed the OEM and put the replacement back in after going to Cruisin the Coast. I spent too much time staring at the temp gauge.

    Should I be worried? What else can be done to improve the cooling of an original cored radiator short of re-coring it?

    Thanks,
    Bryan
     
  7. COPO

    COPO Veteran Member Lifetime Gold Member

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    It was a 2 core. I went into GM Parts and Service and opened a rad box in 1975 cause I couldn't believe that it wasn't a 3 core. I wanted to see it for myself. Yup.
     
  8. COPO

    COPO Veteran Member Lifetime Gold Member

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    I would try a 160* stat in it for the summer with the OEM rad. If it gets recored then go for 3 rows.
     
  9. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

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    All you did was replace the radiator to see this temp difference? What temp thermo do you have installed?
     
  10. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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    I've heard, don't know if it's true that a 160 helps for borderline detonation issues.
     

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