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Thread: Road Race floats for a Quick Fuel Carb?

  1. #1
    Member JRD56's Avatar
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    Road Race floats for a Quick Fuel Carb?

    I'm just finishing up my build and I'm planning to do an autocross event with the local club. I'm running a stock Quick Fuel carb (SS-650 AN) on 5.0. I understand some of the cars running a carburetor may have an issue with fuel starvation on hard corners. I'm wondering if I need to put "road race" floats in the carburetor to help prevent this. And if I do, does it impact the normal driving on the streets. I know, I should have gone with fuel injection........
    Purchased and un-assembled Mk3 in 2016. 5.0, Aluminum heads, Performer RPM Air gap, Quick Fuel 650 carb, BBK headers T5, 3.55 rear solid axle, Koni Shocks, PS with Hydra-boost. Also own two restored vintage Mustangs, two Model A fords, 1941 Chevy truck and several other hot rods.

  2. #2
    Senior Member CraigS's Avatar
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    I put them in mine w/ exactly the same carb and it runs great AX and street.
    FFR MkII, 408W, Tremec TKO 500, 2015 IRS, DA QA1s, Forte front bar, APE hardtop.

  3. #3
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    Yes - road race floats.

    Jet extensions also help.


    I consider the Holley Avenger vent tube a necessity too - mostly keeps it from flooding on hard braking.


    s-l300.jpg

    One-Piece-Vent-Tube.jpg

  4. #4
    Senior Member Avalanche325's Avatar
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    I have a Q series, which has the jet extenders. I think it has road race floats, but not positive. Never had a starvation issue.

    I haven't seen that vent extender, interesting. I did get a small header fire once in the shutdown area.
    At about 1:55 here:
    https://www.youtube.com/watch?v=eyVQxBr1KFA&t=112s
    Is that what it is for?

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    Hmm if I’m going to be doing track days and autox, are these items a must?

  6. #6
    Senior Member Mark Dougherty's Avatar
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    not a must
    BUT
    they sure do help.
    Without the above mentioned parts the carb will fload over, and want to stall under high G loads.
    The traveling Builder
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  7. #7
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    Thanks for the info

  8. #8
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    Quote Originally Posted by Avalanche325 View Post

    I haven't seen that vent extender, interesting. I did get a small header fire once in the shutdown area.
    At about 1:55 here:
    https://www.youtube.com/watch?v=eyVQxBr1KFA&t=112s
    Is that what it is for?
    That's it exactly.

    Also (probably) the black smoke at 3:15.


    Also, if you're working on it probably ought to make sure you've got vent baffles / whistles installed:

    67.jpg
    Last edited by mike223; 03-14-2018 at 07:16 AM.

  9. #9
    Member JRD56's Avatar
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    Thanks everyone for the reply's. I've got a set of roadrace floats on the way. I would think the floats would need to be notched for jet extensions, so I'll need to research that some.

    The vent tube mods make sense too, so I'm wondering if the tube shown above will fit on a Quick Fuel. Since Holley (actually High Performance Industries) now owns Quick Fuel I'll give them a call to discuss.

    My first Autocross event is in May so I've got some to time to work this all out.

    Jim
    Purchased and un-assembled Mk3 in 2016. 5.0, Aluminum heads, Performer RPM Air gap, Quick Fuel 650 carb, BBK headers T5, 3.55 rear solid axle, Koni Shocks, PS with Hydra-boost. Also own two restored vintage Mustangs, two Model A fords, 1941 Chevy truck and several other hot rods.

  10. #10
    Unconventional Builder Joee's Avatar
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    Quote Originally Posted by Mark Dougherty View Post
    not a must
    BUT
    they sure do help.
    Without the above mentioned parts the carb will fload over, and want to stall under high G loads.
    I have not really had any problems and only noticed slight hesitation on big sweepers at Pocono AutoX.

    According to their site my SS 650 has •Race-ready with notched secondary floats and jet extensions

    So are my current QF floats and vent tubes ok or should I look into "race" floats and that Holley Avenger tube listed above ?
    Last edited by Joee; 03-14-2018 at 12:50 PM.
    Roadster Mk3 5294, 302 Comp XE276HR cam, AFR 185 heads, 650 Quick fuel carb, Air Gap intake, T-5 3.55 gear Levy Upper & Lower Front and Rear control arms Purch Jan 2008 Tagged Mar 2012 Best ET 12.14 @113** SOLD 4/8/18 **
    YouTube Videos: Current performance - https://www.youtube.com/channel/UC7c...86xO3U4l4RtVMQ Older build - http://www.youtube.com/user/joeembery#p/u My Pics:
    http://s207.photobucket.com/user/Joe...?sort=6&page=1

  11. #11
    Senior Member Mark Dougherty's Avatar
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    Joe
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    if it aint broke ..........you know the rest
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  12. #12
    Unconventional Builder Joee's Avatar
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    Thanks Mark
    Roadster Mk3 5294, 302 Comp XE276HR cam, AFR 185 heads, 650 Quick fuel carb, Air Gap intake, T-5 3.55 gear Levy Upper & Lower Front and Rear control arms Purch Jan 2008 Tagged Mar 2012 Best ET 12.14 @113** SOLD 4/8/18 **
    YouTube Videos: Current performance - https://www.youtube.com/channel/UC7c...86xO3U4l4RtVMQ Older build - http://www.youtube.com/user/joeembery#p/u My Pics:
    http://s207.photobucket.com/user/Joe...?sort=6&page=1

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