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Old 03-08-2009, 02:43 PM
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Holley 4bbl carbs.. differences?

I've recently stumbled onto a Holley 4011 series carb
List #84021 1970 also says 12R-10658B with the list number on the choke horn.
Holley's webpage says it's a 650cfm 4011
but I can't find ANY information on what makes a 4011 different from a 4150/4160? I'm really quite curious about the dual accellerator pumps front and rear..
and IIRC it is a spreadbore carb.

it would also appear to closely resemble the 'summit racing' carbs that are now being sold.. which makes me sorta go 'hrrrmmmm...'


and if anybody knows what a LIST-1923 2484 carb is, I'm all ears ~

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Old 03-08-2009, 09:26 PM
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They are vastly different from the 4150 and 60's as they are a cast aluminum one piece deal.

I've done quite a bit of work and mods to the 4010 & 4011 series and I see Summit now offers them in there own product line.

The idle system does require extensive mods if it is to run properly on a large CI engine with a decent size cam.

One major short fall is the two corner idle.
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Old 03-10-2009, 08:02 PM
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ok, so the 4011 is functionally no different then a 4150/60 with vac secondary carbs? I realize they might work differently but it's not like comparing a vac secondary with a double pumper type of difference? (if that makes any sense)
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