Were Clutch Fans Standard or Optional on a 1970 350?

Discussion in 'Small Block Tech' started by Paul Stewart, Aug 30, 2018.

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  1. Paul Stewart

    Paul Stewart Well-Known Member

    Or were the not used at all?

    Thank you!
     
    Paul Stewart, Aug 30, 2018
    #1
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Yes, they were used. Might have been part of the HD cooling package or for A/C equipped cars. I would think all GS350's got them. I might be wrong.
     
    LARRY70GS, Aug 30, 2018
    #2
  3. 1970 STAGE 1

    1970 STAGE 1 Well-Known Member

    My A/C car has one , build sheet BG .
     
    1970 STAGE 1, Aug 30, 2018
    #3
  4. Paul Stewart

    Paul Stewart Well-Known Member

    My high compression 350 doesn’t on the ‘70 Skylark withoutA/C.

    They should help move more air and help with cooling correct?
     
    Last edited: Aug 31, 2018
    Paul Stewart, Aug 30, 2018
    #4
  5. 1970 STAGE 1

    1970 STAGE 1 Well-Known Member

    Yes , they have more fan blades on the clutch fan.
     
    1970 STAGE 1, Aug 30, 2018
    #5
  6. Dano

    Dano Platinum Level Contributor

    I don't believe non-A/C, non-H/D cooling 350 cars got a fan clutch unfortunately. I saw something not long ago (maybe on here) about the HP to turn a solid fan vs. a fan clutch and it was significant.
     
    Dano, Aug 31, 2018
    #6
  7. Bigpig455

    Bigpig455 Fastest of the slow....

    I seem to recall that standard, base 350's had a solid, 4 blade steel "X" fan. I know 300's and 340's did. Good news is it's an cheap, easy HP adding bolt on improvement on any car. It's the first thing I do to a car I buy if it doesnt have one.
     
    Bigpig455, Sep 1, 2018
    #7
    philbquick likes this.
  8. Paul Stewart

    Paul Stewart Well-Known Member

    Are all the clutch units the same or do they differ between the big and small block?
     
    Paul Stewart, Sep 1, 2018
    #8
  9. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Paul, here's an exercise for you.:D Go over to www.rockauto.com Then look up 70-72 GS, Skylark, 350 and 455 engines. Look under cooling system, then Radiator Fan Clutch. That will answer your question.:)
     
    LARRY70GS, Sep 1, 2018
    #9
  10. Paul Stewart

    Paul Stewart Well-Known Member

    What’s Rock Auto?
     
    Paul Stewart, Sep 1, 2018
    #10
  11. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    LARRY70GS, Sep 2, 2018
    #11
  12. Paul Stewart

    Paul Stewart Well-Known Member

    LOL, sarcasm back atacha!

    Seriously, there are 10 options there and as many or more on EBay. What is the BEST OPTION?
     
    Paul Stewart, Sep 2, 2018
    #12
  13. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    The best clutches are the thermal ones, just pick one.
     
    LARRY70GS, Sep 3, 2018
    #13
  14. Paul Stewart

    Paul Stewart Well-Known Member

    10-4

    Thank you
     
    Paul Stewart, Sep 3, 2018
    #14
  15. Kaule

    Kaule Gold Level Contributor

    My 71 GS has only the solid 4 blade "X" fan, can i use a thermal clutch with this fan ?
    And if so, better a heavy duty clutch ? Hayden, GMB or Four Seasons ?


    I have searched for information to understand the clutches, found this:
    https://www.onallcylinders.com/2016/11/10/understanding-fan-clutches-time-replace/
     
    Kaule, Sep 3, 2018
    #15
  16. alec296

    alec296 i need another buick

    Is it safe to assume you have a cooling problem ? I’m sure there’s an explanation vs trying to update a system that should be efficient enough to cool for your car. .
     
    alec296, Sep 3, 2018
    #16
  17. Kaule

    Kaule Gold Level Contributor

    No cooling problem here, but would it be an improvement ? I have seen the stated below also.

     
    Kaule, Sep 4, 2018
    #17
  18. Dano

    Dano Platinum Level Contributor

    From a HP perspective it'd be an improvement and probably better cooling too.
     
    Dano, Sep 4, 2018
    #18
  19. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    The purpose of a fan clutch is to increase fan action when it is needed, and to decrease fan action when it is not. It frees up engine power and cools more effectively. What else do you need to know?
     
    LARRY70GS, Sep 4, 2018
    #19
  20. Kaule

    Kaule Gold Level Contributor

    I was not sure if the 4 blade fan can be used with a clutch and if i should prefer a manufacturer.
     
    Kaule, Sep 4, 2018
    #20
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