1970 GS stage 1 radiator specs

Discussion in 'Chassis restoration' started by Weisguy184, Feb 20, 2019.

  1. Weisguy184

    Weisguy184 Well-Known Member

    Hello, Fritz found date correct tanks for my GS. I am having the radiator rebuilt and I want to make sure that the shop I have doing it has the correct specs for the core. My car is a 1970 Stage 1 manual transmission non a/c car. Thanks, Marc.
  2. copperheadgs1

    copperheadgs1 copperheadgs1

    They were three core. See if your guy can get Maine cores. They are or at least were the best. Biggest thing is finding a guy that knows what he is doing. Radiator re-coring is a lost art.
  3. Weisguy184

    Weisguy184 Well-Known Member

    I think that I have the right guy. He is an old timer. I will check on that brand. What he is asking for are the dimensions.
  4. pglade

    pglade Well-Known Member

    It depends on how "the industry" measures the cores....ie - from EXACTLY what spots on the cores they take measurements.

    I just measured an original, still assembled, '70 Olds Abody 4 row core......the core is 17-1/8" tall(that doesn't include the height of the bottom and top "cross rails"...that would add more) and anywhere from 28-1/2 to 29 inches wide depending on how it's measured.

    As far as core thickness......you may have options depending on if you opt for a "high efficiency" core (ie wider tubes, etc). Anyway, the core thickness on mine won't be of any help since they are thicker 4 row cores.

    Obvious caveat is this is for a '70 Olds (442, etc) so maybe the cores weren't EXACTLY the same height and length but I believe there was some "standardization" of the cores among the various GM brands back then....but not 100% sure.
  5. BadBrad

    BadBrad Got 4-speed?

    Of what did "Heavy Duty Cooling" consist? 'twas an option.
  6. copperheadgs1

    copperheadgs1 copperheadgs1

    I think just one of the tanks was bigger. You have to know the two letter codes on them. Be careful if you go to thick as it may cause issues with fan shroud mounting. I bet Patton’s Olds height and width were the same. I have an original two core at home but height and width are the same. I can get those for you. Most important thing is core support rubbers have to fit. I would give your guy the radiator cover so he can make sure it fits. That would ensure correct width.
  7. copperheadgs1

    copperheadgs1 copperheadgs1

    Also if you read Assembly manual says Heavy duty cooling not available on Stage 1. It’s all damn confusing.
  8. Duane

    Duane Member

    "Also if you read Assembly manual says Heavy duty cooling not available on Stage 1. It’s all damn confusing."

    That's because the Stage 1 Option was supposed to include the "Heavy duty cooling package in it. With the AC pulleys, and the bigger radiator, but we all know there were some Stage 1 Non-AC 4-speed cars that came with the smaller "SJ" radiators. (Tank codes CF & IA.)

    If you want to know the specs of your radiator then you need to let us know which radiator you have.
    BadBrad and Brett Slater like this.
  9. Weisguy184

    Weisguy184 Well-Known Member

    My car is a manual transmission, non AC Stage 1 with heavy duty cooling. I have CF and IA tanks. I don’t have a tag , I am not sure of the code. The build date is third week in October 1969.
  10. flynbuick

    flynbuick Super Moderator Staff Member

  11. copperheadgs1

    copperheadgs1 copperheadgs1

    That’s the Confusion Duane, the Stage coming with the smaller radiator when it should be larger heavy duty cooling SW radiator, I bet that chart confused assembly line workers too!
  12. Duane

    Duane Member

    You're supposed to read the chart from the top down, and the first rad that fits the build is supposed to be the one you use. There are also different versions of that chart, as it was changed to different revisions when the assembly manuals and Wholesale Car Order Forms changed.

    You can only take that chart so far, as it also depended on the parts that were in the plant at the time..................plus just because a Build Sheet shows a specific part for the car, it does not necessarily mean that was the way it was built.

    We talk about this chart all the time, and it's actually getting to the point of stupidity. What did Einstein say, "The definition of insanity is........................
  13. Weisguy184

    Weisguy184 Well-Known Member

    Thanks Flynbuick! I order the tag from TTP.
  14. 1970 STAGE 1

    1970 STAGE 1 Well-Known Member

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