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slumlord444
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Group: Forum Members
Last Active: 3 Months Ago
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Thanks everyone for the input. Helpful as always. Decided to go with the Holley 4150 Street Avenger HLY 0-80770, The Summit Ted recomended also impressed me but the old school in me decided to go with Holley. Should be here in a week and as soon as I get it set up and get a warm enough day to take a top off test run I'll let you know.
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Hoosier Hurricane
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Ted: Thank you for that information. I never knew Holleys had idle fuel flowing in the secondaries. That's good engineering.
John - "The Hoosier Hurricane"
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kevink1955
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Ted (11/7/2019)
Hoosier Hurricane (11/7/2019)
Ted:
I have often wondered about vacuum secondary Holley style carbs when mildly driven and never opening the secondaries. Does our alcohol laced gasoline "go bad" sitting in the secondary bowls for long periods of time? I wonder about my dual Holleys on my 427 in my R code '63 Galaxie. I almost never get into it hard enough and long enough to empty the secondary bowls and refill with fresh fuel. Maybe I should just give the car to a grandson so he can keep the fuel fresh, that is, if he can afford to keep 93 octane in it.Holley four barrel carbs (including the Summit badged models) have idle circuits on the secondary side. While these are ‘fixed’ (non-adjustable) on most of the carbs, they do allow the fuel to be constantly turned over in the secondary bowls abeit just a bit slower than the refresh that takes place on the primary side if just idling. Hence, the fuel in the secondary bowls should not be any more ‘stagnant’ than the fuel in the primary bowls.
Ted, Good to know. I wondered about stagnant fuel myself so I just get on it once in a while. Should I give that up ?? No. It's to much fun
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Ted
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Group: Administrators
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Hoosier Hurricane (11/7/2019)
Ted:
I have often wondered about vacuum secondary Holley style carbs when mildly driven and never opening the secondaries. Does our alcohol laced gasoline "go bad" sitting in the secondary bowls for long periods of time? I wonder about my dual Holleys on my 427 in my R code '63 Galaxie. I almost never get into it hard enough and long enough to empty the secondary bowls and refill with fresh fuel. Maybe I should just give the car to a grandson so he can keep the fuel fresh, that is, if he can afford to keep 93 octane in it.Holley four barrel carbs (including the Summit badged models) have idle circuits on the secondary side. While these are ‘fixed’ (non-adjustable) on most of the carbs, they do allow the fuel to be constantly turned over in the secondary bowls abeit just a bit slower than the refresh that takes place on the primary side if just idling. Hence, the fuel in the secondary bowls should not be any more ‘stagnant’ than the fuel in the primary bowls.
  Lorena, Texas (South of Waco)
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Hoosier Hurricane
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Group: Moderators
Last Active: 3 hours ago
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Ted:
I have often wondered about vacuum secondary Holley style carbs when mildly driven and never opening the secondaries. Does our alcohol laced gasoline "go bad" sitting in the secondary bowls for long periods of time? I wonder about my dual Hollies on my 427 in my R code '63 Galaxie. I almost never get into it hard enough and long enough to empty the secondary bowls and refill with fresh fuel. Maybe I should just give the car to a grandson so he can keep the fuel fresh, that is, if he can afford to keep 93 octane in it.
John - "The Hoosier Hurricane"
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Ted
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Group: Administrators
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While almost any carb can be made to work, if wanting new then I’ll recommend the Summit vacuum secondary carbs. Runs good out of the box and the as delivered jetting is close for most applications while being available in 500, 600, and 750 cfm versions. They also feature annular fuel discharge nozzles and these do a much better job at atomizing the fuel than the standard straight leg or drop leg fuel nozzles. Those carbs are made by Holley for Summit and as a result, use Holley needle and seat assemblies, power valves, accelerator pump diaphragms, and jets among other shared parts. As a general rule for selecting a vacuum secondary carb, go bigger than you think you need. When properly set up, the vacuum secondaries only open the amount needed based on the air flow of the engine. If you pick a vacuum secondary carburetor that appears to be too big based on the total air flow available through it, it will always have the optimum amount of air flow due to the secondaries only opening the amount needed. Said another way, it will never be oversized and will provide only the air flow that the engine requires. Any Y that’s been modified with a better flowing intake manifold, any kind of head work, camshafts, or improved exhaust will benefit from having larger than stock sized carbs. I use the 750 versions on those Y’s that have the normal street performance upgrades. https://www.summitracing.com/search/brand/summit-racing/product-line/summit-racing-m2008-series-carburetors/part-type/carburetors
Lorena, Texas (South of Waco)
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Lord Gaga
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A Summit 750 CFM
"FREE SAMPLE"
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62bigwindow
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Have you looked into Quick Fuel carbs? My buddy talked me into getting one and I'm happy I did.
Durham Missouri
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slumlord444
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Group: Forum Members
Last Active: 3 Months Ago
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The Summit sounds like an option. Does it use Holly jets, accelerator pumps, power valves, and vaccum secondary springs or to you have to use Summit specific parts?
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Joe-JDC
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A Summit 750 vacuum secondary would more than suffice for a 400 hp build, and would not be leak prone like the Holleys when they sit, or have the gaskets dry out. If you get the jetting right, then there should not be any difference in power, and the Summit carb is a lot less expensive. Out of the box, it was only a few hp difference than the tweaked Holley Ted uses on all his dyno tests. Joe-JDC
JDC
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