'67 radiator help

Discussion in 'The Bench' started by john.schaefer77, Aug 7, 2017.

  1. Gary Bohannon

    Gary Bohannon Well-Known Member

    * TA super water pump is necessary for the small radiators on 64 to 67.
    * An engine tiedown on the driver side will prevent destroying all that work and money when the motor mount breaks!
    Ask me how I know...
     
  2. BuickV8Mike

    BuickV8Mike SD Buick Fan

    Does anyone know off hand what size bolts are used to hold the fan to the clutch? I need to space my fan out of the shroud an inch or so.
     
  3. FJM568

    FJM568 Well-Known Member

    The fan to clutch bolts are 5/16-18.
     
  4. BuickV8Mike

    BuickV8Mike SD Buick Fan

    Thanks Jim..Is that 5 or 6 bolts?
     
  5. FJM568

    FJM568 Well-Known Member

    There should be 4. The originals are either 1/2 or 3/4 long.
     
  6. Ant Legrand

    Ant Legrand Well-Known Member

    I looked more closely at some pics of stock 300 shrouds vs what I have. While the shape is very similar, I don't know if one could be trimmed enough to look like the one I have. Perhaps mine is a custom or aftermarket shroud?
     
  7. FJM568

    FJM568 Well-Known Member

    Hmm. Yours does look slightly different than my original 66 Skylark 300 shroud. I wonder if yours might be from a v6 car or even some other model.


    There is a molded in part number on mine. It is at the top on the passenger side of the single bolt hole that goes into the radiator top plate. You should be able to see it with a light. It is on the vertical flange the bolt goes through.

    Mine is 1372784.
     
  8. FJM568

    FJM568 Well-Known Member

    I've done some looking around online. Even finding pics of the elusive 67 GS400 fan shroud is tough. The pics I did find of the full shroud looks a lot like yours, I believe yours is a GS400 shroud.

    I'll find out more tomorrow when I try to fit my 300 shroud back on my car with my 455.
     
    Last edited: Aug 10, 2017
  9. Chi-Town67

    Chi-Town67 Gold Level Contributor

    Looks like my GS 400 shroud to me. 20130907_165348.jpg 20130907_165359.jpg 20130907_165348.jpg 20130907_165359.jpg 20130907_165218.jpg
     
    FJM568 likes this.
  10. FJM568

    FJM568 Well-Known Member

    How deep is the 67 GS400 shroud?
     
  11. Ant Legrand

    Ant Legrand Well-Known Member

    Yeah it sure does. I stand corrected then. I thought the GS 400 shroud was just a small plate on the top. Like this (pic attached). Thanks for clearing that up. Now it makes sense why it fits so good!
     

    Attached Files:

  12. FJM568

    FJM568 Well-Known Member

    I have trimmed my 300 fan shroud down from 5 in thick to 3 in thick. I still have to reattach the upper bolt flange and notch the bottom for the core support tangs. Hoping it works!

    So how deep is a real 67 GS400 fan shroud?
    7172017133140.jpg
     
  13. TrunkMonkey

    TrunkMonkey Well-Known Member

    Flex fans do not create "lift" in the front side, so they cannot effectivly "pull" air.
    That is why "good" fan blades have varied pitch and camber, they are "air screws", same as an aircraft propeller.

    Flex fan blades are piss poor propellers.

    And many of the cheap ones will crack along the rivits and fail, often slicing and dicing your radiator, belst and hoses.
     
  14. Chi-Town67

    Chi-Town67 Gold Level Contributor


    I'll have to measure and report back.
     
  15. FJM568

    FJM568 Well-Known Member

    Thanks Nick.

    Hopefully it'll fit and work properly. I definitely needed it. If I measured correctly, my clutch fan blades should be a little more than halfway in the shroud.
     
  16. Chi-Town67

    Chi-Town67 Gold Level Contributor

    It's about 3" at the top where the hump is.
     
  17. FJM568

    FJM568 Well-Known Member

    Perfect. That's exactly what I've got now. I just hope the fan's centered in the opening, other than that, I think it should work.
     
  18. FJM568

    FJM568 Well-Known Member

    OK. Here is my modified 300 fan shroud that is now installed with my 455. I trimmed 1 1/4" from radiator side and 3/4" from the round fan side. The stock 300 shroud is 5" deep and my modified shroud is now 3" deep.

    Now, here is the trick. The fan offset on the 300 fan is the wrong way. I flipped the shroud upside down, cut the slot for the core support tab on the lower drivers side, the angled tapered corner on passenger side fits between the lower core support tab and radiator and I fabricated a tab to bolt the upper center of the shroud to the upper radiator support plate.

    I think it turned out rather well, and if I didn't just tell everyone it's a modified 300 shroud, you probably wouldn't know it.

    IMAG0774.jpg IMAG0776.jpg

    Thanks to Walt for mentioning trimming the 300 shroud and flipping it. If it wasn't for him, I probably wouldn't have attempted it.
     
    Last edited: Aug 26, 2017
    Ant Legrand likes this.

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