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  •  » Carburator

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    6/01/2019 4:43 PM  #1

    RV6
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    From: Pine Junction, CO
    Registered: 3/01/2016
    Posts: 1,250

    Carburator

    I currently run a 570 CFM Street Avenger on my little 289. Tuning at altitude has been a bear as I live at 8500' MSL. I'm not exactly thrilled with my current carb, although it works great at sea level with the right jets. I have been thinking of buying Summit's version of the 4100 as I have heard nothing but good about this little carb. Specifically this one: Summit Racing® M2008 Series Carburetors SUM-M08500VS500 CFM would be perfect so I'm thinking of ordering one. Heck, it's only $300 and some change. Does anyone have any input, good or bad, about this carb? 
    How hard is it to change jets as I go to Sea Level from my house? I usually change jets twice in my Holley as I go down hill. 

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
     

    6/01/2019 8:24 PM  #2

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,874

    Re: Carburator

    Is it the same style as the Edelbrock?? (I guess I could look-it-up) At least with those....jet change is wayyyyy less messy when compared to a Holley.  Change jets in an Eddy and never spill a drop of gas.
    6s6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    6/01/2019 9:20 PM  #3

    zakdaddy99
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    From: Olathe, KS
    Registered: 4/01/2013
    Posts: 150

    Re: Carburator

    Your setup is the same as mine. I had a 570 and went to the summit 500 carb. Mine was jetted fine from the factory. However the top of the carb comes off to change the jets like an Edelbrock. But it uses all Holley parts. So there is no fuel spilling when changing jets. The throttle response is great. I'm happy with my setup.

    Good, fast or cheap. Pick any two...
     

    6/02/2019 5:16 AM  #4

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,524

    Re: Carburator

    For another $35 you can just get an Edelbrock 500.  I've heard good things about the Summit carbs, but have no personal experience with them, but loads with Edelbrocks. I also know Edelbrock carbs are made in the USA.  I'd bet dollars to doughnuts that the Summit carbs are made in China.

     

    6/02/2019 7:04 AM  #5

    John Ha
    I FYI 24-7

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    From: Mitchell, SD
    Registered: 4/02/2013
    Posts: 936

    Re: Carburator

    Edelbrock carbs are really good in terms of being easily adjustable but the one I bought had casting flash inside the bores between the choke plate and the throttle plates.  I was able to remove it fairly easily with a file and some sandpaper glued to a dowel but it seemed to me that a quality part would not have had that stuff in there.

    Founding Member of the Perpetually Bewildered Society
     

    6/02/2019 6:48 PM  #6

    Hornman
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    From: Mansfield, Texas
    Registered: 4/01/2013
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    Re: Carburator

    The Summit carb is based on the Autolite 4100 except that it uses Holley jets, so you can actually tune them. Based on reports from verified owners they tend to come with either casting grit or sand in them, so a disassemble and clean before using would seem to be called for.

     

    6/02/2019 7:30 PM  #7

    Steve69
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    From: Madison Wisconsin
    Registered: 4/01/2013
    Posts: 2,741

    Re: Carburator

    I had the holley 570 street avenger.  I didn't care for it either.  I switched to a Street Demon.  Didn't like that either.  Switched to Fitech EFI.  Its been working pretty good.  If I was going to go carburetor I would try the Summit Carburetor.  Has a lot of good reviews and a great price.  Steve69

     

    6/03/2019 7:58 AM  #8

    RV6
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    From: Pine Junction, CO
    Registered: 3/01/2016
    Posts: 1,250

    Re: Carburator

    I'm not interested in going the Edelbrock route and have little interest in EFI. Heck, I'm still running points.
    I've been pondering this for quite some time and will keep pondering. No reason to make the change right before the Bash run.
     

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
       •Thread Starter
     

    6/03/2019 8:28 AM  #9

    red351
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    From: Carlisle, PA
    Registered: 5/31/2018
    Posts: 445

    Re: Carburator

    I put a lot of time and $ in a 670 avenger. It never worked, and got put on the shelf for parts. Had much better luck with a double pumper. If I had to do it over again, I would go with the Summit carb.

     

    6/03/2019 10:23 AM  #10

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,980

    Re: Carburator

    Tuning a Holley is not rocket science, just time consuming. First off educate yourself on how the particular carb you have needs to be set up by using Holly's installation, tuning and adjustment manual then go to www.bob2000.com/carb.htm and down load Gerards "How to tune your Holly carb" and read it twice and follow the instructions to the "t".
     I got a new 670 Street Avenger carb from Pep Boys on sale when I built my 331, at the time It was about $260.00 USD.
    I had to do 2 jet changes and 1 power valve to get it running perfectly. The only adjustments needed since were idle changes due to an an A/C addition and a later P/S removal.
     It runs the same now as it did at first with over 10,000 miles on it.
     I have to admit that it may be easier to tune a Rochester/Carter/Edelbrock product but in my book it's Holley FTW.
     I have no expirience with the Summit Street and strip carb but read many very good things about it. Since it is a clone of the Autolite 4100 arguably "the best designed ever, (John Enyeart), it should be given serious consideration.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    6/03/2019 1:03 PM  #11

    RV6
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    From: Pine Junction, CO
    Registered: 3/01/2016
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    Re: Carburator

    I agree; Tuning a Holley is not rocket science. I've been doing it for years. Tuning this one for 6000-8500 feet MSL is a crap shoot. It works absolutely perfect at sea level. I just have to re-jet on the way down or start off running really rich.

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
       •Thread Starter
     

    6/03/2019 2:10 PM  #12

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,980

    Re: Carburator

    I set mine up for 580 ASL and ran good at the highest it has ever been was along the Blue Ridge Mountain Parkway.
     It is said that jet changes are needed every 2000 feet of elevation.

    Last edited by Rudi (6/03/2019 2:12 PM)

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    6/03/2019 2:13 PM  #13

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,524

    Re: Carburator

    No, its not rocket science, but it is a PITA, and you don't realize that until you run a carb that's actually easy to tune like an Edelbrock.  I made Holleys work for decades, Q-Jets too.  If you understand how to tune a carb you can tune any carb, its just a question of how easy that tuning is.  My Edelbrock ran great out of the box.  I tinkered with it because I wanted to most out of it.  In the end I leaned it out two steps and it runs like a scalded dog compared to how it used to.  All told I have maybe two hours in tuning it including test drives. 

    Holleys are fairly easy to get right at WOT and idle, but are often not fun to tune anywhere else.

    Yeah, for years I ascribed to the whole "Holleys are the king of HP" line too.  Let me tell you; its a crock. 

     

     

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