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FNG

  • Karma: +0/-0
Holly carb?
« on: July 12, 2010, 09:59:21 PM »

I’m looking to replace the current Holly carbs I have, but I can't figure out what they are... :mad:  I have been trying all the #'s I found on them just to get nowhere.  If you can help me to know what I have, I would appreciate it.

All the #' On the Holly carbs (Center top) 4150 hp, (R. side middle) "list" 805761 under this # is 1566,(R.side bottom 11874BR under that HP, (on left side) 11938
 
Thinking about getting two, Mighty Marine Demon 825 CFM Supercharger Carburetors to replace these warn out Hollys.  I know less than zip about carbs and want to get the correct ones. 
I have a Chevy 502, 6-71 or 8-71 Wieland blower not sure which (how to tell) Not sure about the cam either... Sorry all I’m just trying to learn, if you need more info I can try to offer it ???




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oldmxdog61u

  • Karma: +0/-0
Re: Holly carb?
« Reply #1 on: July 12, 2010, 10:21:03 PM »
Pics 1st...
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Any man whose errors take ten years to correct is quite a man.
J. Robert Oppenheimer

1972Challenger

  • Karma: +1/-0
Re: Holly carb?
« Reply #2 on: July 12, 2010, 11:20:57 PM »
honestly just call holley.... i had the same problem with my carb.. i bought a boat with a holley carb and i wanted to buy a rebuild kit for it.. i went to pep boys, and napa and a boat guy and they didnt know crap.. i ended up buying a $40 kit.. then after doin the instal i found out i didnt have the right parts... so i got fed up, called holley and 1 min later i had a list number and a kit number.... i bought the right kit for 20 bucks.... i waisted 40 for nothing....

the moral of the story.... CALL HOLLEY  :banghead:
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IRRebel

  • Karma: +16/-0
Re: Holly carb?
« Reply #3 on: July 13, 2010, 12:20:13 AM »
Well, honestly, if you can't tell the difference between an 6-71 and an 8-71 blower, you need to send it over here before you hurt yourself with it.......... >:D


J/K!!!! You need to send it over so I can ID it for ya......... >:D

Post some pics. Be pretty easy to tell ya what you got. Holley ID not really that important since you wanna replace them anyway, link I used a lot no longer there. PM GTjets, he can tell you what you got.

But I would just put a call in to Quickfuel. Tell them what you got as far as engine, rpm, blower size (We can help ya with that), what pulleys you have on it (Stamped on the blower pulleys) and they can set you up with a bitchen pair of boost referenced carbs no problem.  :thumbup:

Then send your old carbs over and I'll ID them when I get to it......... :sly:

Ray
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"Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways totally worn out shouting 'Holy Shit what a ride!"---Crewcheif22 AKA Keith

crewchief22

  • Karma: +66/-0
Re: Holly carb?
« Reply #4 on: July 13, 2010, 06:47:36 AM »
Quote from: FNG on July 12, 2010, 09:59:21 PM

All the #' On the Holly carbs (Center top) 4150 hp, (R. side middle) "list" 805761 under this # is 1566,(R.side bottom 11874BR under that HP, (on left side) 11938
 

The carbs you have discribed sound like a good combo for what engine you have.   List# 80576-1 is a 750cfm carb designed for 2x4 blower applications.

Are you having a problem with the carbs, or just think by going new it will make it run better?

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The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

75 fantasy

  • Karma: +1/-0
Re: Holly carb?
« Reply #5 on: July 13, 2010, 07:44:44 AM »
welcome to SCJB's
i'm looking for a couple of blower carbs  ;) if you decide to get 825's let me know if you want to sell the 750's and how much.
thanks
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FNG

  • Karma: +0/-0
Re: Holly carb?
« Reply #6 on: July 13, 2010, 11:51:56 AM »
I will post some pictures tonight.
If I do bo for a new set of carbs what do you all recomend?  I like the demon carbs because the price is alot better than Holly.  But with that said the description of the Hollys decsribe this
 "capability that allows their power Valves to reference the intake Manifold vacuum below the supercharger. This allows the power valve to operate as it should, based off intake Manifold vacuum. A power valve provides further enrichment to the main metering system under load (low vacuum)"
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FNG

  • Karma: +0/-0
Re: Holly carb?
« Reply #7 on: July 13, 2010, 12:02:52 PM »
I will post pictures tonight. 
If I was to purchase a new set of Blower carbs (I'm sure this will be open to interpretation) What would be the recommendation.  I like the price on the demon Carbs, but the Holly blower carbs description says
"capability that allows their power Valves to reference the intake Manifold vacuum below the supercharger. This allows  the power valve to operate as it should, based off intake Manifold vacuum. A power valve provides further enrichment to the main metering system under load (low vacuum)"   The Demon Carbs don’t mention that.... seems Important, is it. ???

And is there a fair, person you can recommend close to Murrieta Ca. that REALLY knows how to tune Carbs(and also might be willing to teach a FNG)?
Thanks.

P.S. if i do get new carbs I will defiantly sell the ones I have.
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