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69 overflow tank

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  • Kelly Burnside

    69 overflow tank

    I have a 69 corvette that does not have an overflow tank. The car is the original 350/300 with an automatic. No A/C. The judging manual shows that I should have one but I have read numerous books where this particular setup should not have an overflow tank. I believe that the front is original and there are no holes (just dimples) where the overflow tank should be.
    In the book 1969 Stingray Guidebook by John Bizzoco on the bottom of page 128 he states that a small block car with M40 should have a copper radiator (which I have), a plastic shroud (have that as well), and no expansion tank. My car fits that criteria but the NCRS book says otherwise.
    I have read other books/magazines stating that that is the correct combination.
    I would like to know if this is the correct combination or should I go with what NCRS has to say in their book.
    Thanks for the help....
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43203

    #2
    Re: 69 overflow tank

    Kelly------

    Your 1969 300 hp/350 with automatic transmission was originally equipped with radiator GM #3018802 which is a copper brass radiator. This radiator DID NOT use an external supply tank. It, and its "sister" radiator GM #3018803 (same radiator but without auto trans cooler fittings and used on small block with manual trans and A/C as well as many L-46 engines)were the ONLY 1969 Corvette radiators which did not use an external supply tank. ALL other 1969 radiators did use an external supply tank.
    In Appreciation of John Hinckley

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    • Kelly Burnside

      #3
      Re: 69 overflow tank

      Thanks for the information. I will keep a record of this as well as pass it on to one of the NCRS judges...
      Thanks again for the help...

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