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Old 08-23-2010, 08:34 PM
chevykid90's Avatar
454, what turns your crank?
 

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Holley 8700 650CFM, any thoughts??

so i just picked up a Holley 8700 series carb of a guy on CL for 7 bucks. along with 3 old Q-Jets and 2 old chevy one wire alternators. all for only 7 bucks!

so my question lies within the Holley 8700, my numbers book says its a 650CFM and was put on the BBC 396. would it be worth it to rebuild it and put on my mild 454? i just couldn't pass up a deal like that.

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Old 08-24-2010, 07:32 AM
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Well, it's an emissions calibrated spreadbore 650 cfm w/vacuum secondaries and likely the reverse idle screws. I recall them weighing more than any spreadbore carb I had ever messed with- a real chunk o' metal.

It will work OK once it's rebuilt and jetted/tuned correctly for whatever it is that it will be used on.

SUMMIT and others carry a kit for it, if its needed.
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Old 08-24-2010, 10:24 AM
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454, what turns your crank?
 

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i thought it was just me, lol. this thing seems like it weighs s ton!
thank you for the input, not sure what i am going to do with it yet.

pulled it apart last night and it had a set of 82 jets, those too big?
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Old 08-24-2010, 10:33 AM
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If that is the front jetting, yes it is way too big. Should be about 64. Sounds like someone who didn't know what they were doing trying to make an emissions carb work on a motor that has a bigger than stock cam. The emissions type carbs are not performance friendly due to the reverse idle system, even at full rich it is typically not rich enough for anything larger than a stock engine.
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Old 08-24-2010, 10:35 AM
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454, what turns your crank?
 

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thats kinda what i was thinking about the jet being that big.

what do you mean by reverse idle?? so this really would would not do good on mild big block.
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Old 08-24-2010, 12:23 PM
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The reverse idle system has a fixed fuel orifice for the idle feed, just like normal, but instead of putting the needle adjustment into a fuel passage from this idle feed restrictor like a normal Holley, the idle mixture adjustment needles are in a passage from the air bleed. The idle needles only control the bleed air at idle, and not the fuel discharged, that is a fixed amount controlled by the idle feed restricter. The metering block passages are configured different to allow this.

Easy "tell" for the emissions carb is the idle needles will have a very blunt round tip, instead of coming to a point like conventional needles.

Emissions carb are not very performance friendly, don't like cams with more overlap than stock or lower vacuum than stock because they are so lean. They can be "corrected" over to ordinary Holley metering blocks, but you have to know what you are doing as far as resizing bleeds and fuel restricters.
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Old 08-24-2010, 12:34 PM
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454, what turns your crank?
 

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ok cool, so then i will just rebuild and resell.
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Old 08-24-2010, 01:07 PM
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Quote:
Originally Posted by chevykid90
so i just picked up a Holley 8700 series carb of a guy on CL for 7 bucks. along with 3 old Q-Jets and 2 old chevy one wire alternators. all for only 7 bucks!

so my question lies within the Holley 8700, my numbers book says its a 650CFM and was put on the BBC 396. would it be worth it to rebuild it and put on my mild 454? i just couldn't pass up a deal like that.
Hey . I'll take one of the Q-jets and give you $7 just for it . I'd like to have one to play with to put on my T-bucket to see if I can better my mileage . I burn two 7 gallon tanks of gas a week just cruisin' the drag . Seriously . PM me if you're interested in partin with one .
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