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History Blower identification

Discussion in 'Traditional Hot Rods' started by kustomdeluxe, Mar 4, 2018.

  1. kustomdeluxe
    Joined: Sep 28, 2017
    Posts: 50

    kustomdeluxe
    Member

    Guys got an old blower for 500 bucks. He's not sure what it is. Any help with identifying and if its worth the 500 would be appreciated.
    00l0l_fROmVnYXegB_1200x900.jpg
     
  2. Paul
    Joined: Aug 29, 2002
    Posts: 14,638

    Paul
    Editor

    Looks like a 3-71
     
  3. Looks from the pic, like a 371.
     
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  4. squirrel
    Joined: Sep 23, 2004
    Posts: 45,304

    squirrel
    Member

    should be worth the money if you have something that it would fit on. You'd have the bitchen-ist car on cruise night.
     
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  5. Deuces
    Joined: Nov 3, 2009
    Posts: 18,420

    Deuces
    Member
    from Michigan

    Almost looks like it'll bolt on a 4-bbl intake manifold....
    I could be wrong....
     
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  6. The little blower should probably be disassembled and everything checked,or bad things could occur . If you want a very nice 144, I have one for sale. PM me if interested.
     
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  7. kustomdeluxe
    Joined: Sep 28, 2017
    Posts: 50

    kustomdeluxe
    Member

    Thanks fellas, I was thinking of grabbing it for a flathead. Guy claims its from the 50's so a rebuild would be in order.
     
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  8. Paul
    Joined: Aug 29, 2002
    Posts: 14,638

    Paul
    Editor

    It would be really cool on a small motor,
    Something vintage in the 200 +/- inch range
     
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  9. dana barlow
    Joined: May 30, 2006
    Posts: 3,777

    dana barlow
    Member
    from Miami Fla.
    1. Y-blocks

    Yes its 3-71 an just right size for flathead or even any motor under 300 an less then about 8 to 1. Roll it over by hand by pulley an feel if its smooth or or not,its tell on bearings an vain. Give ya a idea of,if just clean up or needs bearing etc.
     
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  10. chevy57dude
    Joined: Dec 10, 2007
    Posts: 5,406

    chevy57dude
    Member

    The drive & rear plate are worth that much. With carbs?
    I'd be all over it.
    But then again, I have a problem....
     
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  11. partsdawg
    Joined: Feb 12, 2006
    Posts: 2,615

    partsdawg
    ALLIANCE MEMBER
    from Minnesota

    That's $500.00 worth of cool.
     
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  12. flatford39
    Joined: Dec 3, 2006
    Posts: 2,449

    flatford39
    Member

    What were those original equipment on??? Not sure I ever saw one that small. Would be great for a flathead.
     
  13. anthony myrick
    Joined: Sep 4, 2009
    Posts: 5,473

    anthony myrick
    Member

    yee haa
    me likey a lot
    just add a Flathead or straight 6
     
  14. 41rodderz
    Joined: Sep 27, 2010
    Posts: 4,200

    41rodderz
    Member
    from Oregon

    I want it , I want it , I want it :D:cool:
     
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  15. DAHEMIKOTA
    Joined: Aug 12, 2006
    Posts: 117

    DAHEMIKOTA
    Member
    from Tenn

    They were used on GMC diesels. The 3 is for the number of cylinders and the 71 is the cubic inches of each cylinder. Thus 3-71, 4-71, 6-71, 8-71. GM would just add cylinders to increase the size of their engines.That way they could use the same pistons assemblies and sleeves for multiple engine sizes. That blower would be designed for a 213 cubic inch engine.
     
    Last edited: Mar 4, 2018
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  16. flatford39
    Joined: Dec 3, 2006
    Posts: 2,449

    flatford39
    Member

    Thanks...I remember seeing a 6-71 on an old cement truck in a yard along long long time ago.
     
  17. DDDenny
    Joined: Feb 6, 2015
    Posts: 13,212

    DDDenny
    Member
    from oregon

    2-71 also.

    https://en.m.wikipedia.org/wiki/Supercharger

    Positive-displacement superchargers are usually rated by their capacity per revolution. In the case of the Roots blower, the GMC rating pattern is typical. The GMC types are rated according to how many two-stroke cylinders, and the size of those cylinders, it is designed to scavenge. GMC has made 2–71, 3–71, 4–71, and the famed 6–71 blowers. For example, a 6–71 blower is designed to scavenge six cylinders of 71 cubic inches (1,163 cc) each and would be used on a two-stroke diesel of 426 cubic inches (6,981 cc), which is designated a 6–71; the blower takes this same designation. However, because 6–71 is actually the engine's designation, the actual displacement is less than the simple multiplication would suggest. A 6–71 actually pumps 339 cubic inches (5,555 cc) per revolution (but as it spins faster than the engine, it can easily put out the same displacement as the engine per engine rev).
     
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  18. RichFox
    Joined: Dec 3, 2006
    Posts: 9,891

    RichFox
    ALLIANCE MEMBER

    I had an 8-92 Detroit Diesel blower that came with a turbo on top. Often wondered why people used 10-71 and 12-71 blowers instead of OEM 92 series
     
  19. kustomdeluxe
    Joined: Sep 28, 2017
    Posts: 50

    kustomdeluxe
    Member

    image.jpg Rolled the dice and grabbed it from the fella. Came with a couple of 97's on a homemade plate.
     
  20. anthony myrick
    Joined: Sep 4, 2009
    Posts: 5,473

    anthony myrick
    Member

    nice crate engine
     
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  21. kustomdeluxe
    Joined: Sep 28, 2017
    Posts: 50

    kustomdeluxe
    Member

    So this would be a good fit for a 239 cubic inch flathead?
     
  22. flatford39
    Joined: Dec 3, 2006
    Posts: 2,449

    flatford39
    Member

    Yes
     
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  23. chevy57dude
    Joined: Dec 10, 2007
    Posts: 5,406

    chevy57dude
    Member

    Well, you shut the door on a lot of dudes' dream buying it like that.
    No way ya did wrong. How's it turn? Did you flip it and look at the case for scoring?
     
    mad mikey likes this.
  24. Yep, check it all carefully, to avoid disaster. You did good on scoring it for 500$
     
  25. kustomdeluxe
    Joined: Sep 28, 2017
    Posts: 50

    kustomdeluxe
    Member

    Turns over nice. Bearings seem tight. Rotors are a bit scorched and a few nicks.
    I'll clean it up and start digging into it
     
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  26. banjorear
    Joined: Jul 30, 2004
    Posts: 3,779

    banjorear
    Member

    That snout looks flathead length to me. Looks like the used the 3 belt pulleys from a 1st gen. McCullough set-up. Judging by smaller sized of the snout pulley, look to be overdriven but I am no expert on these things.

    Good luck and great score.
     
  27. Still has the mounting flange on the side. That was the 1st thing removed on most.
     
  28. big duece
    Joined: Jul 28, 2008
    Posts: 5,808

    big duece
    Member
    from kansas

    Now you need to find a Cragar rear cover like this for it. The rear bearing plate stays in place, just cover it with something coool. thumbnail (12).jpg
     
  29. kustomdeluxe
    Joined: Sep 28, 2017
    Posts: 50

    kustomdeluxe
    Member

    I think I remover seeing something similar in the classifieds here.
    Just when I think I'm decent at tuning a carb I pull in home with this!
    Lots of new to learn.
     
  30. kustomdeluxe
    Joined: Sep 28, 2017
    Posts: 50

    kustomdeluxe
    Member

    It was definitely run as is. The adapter plate for carbs has residue marks.
     

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