Holley 4011

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Oct 2, 2005 | 08:33 PM

Chris69

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Burning Brakes

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Holley 4011

Any comments out there on the performance/maintenance attributes (or not) of the older Holley 4011 (800cfm) spreadbore? Lars?

Last edited by Chris69; Oct 2, 2005 at 08:49 PM.

Oct 3, 2005 | 01:25 PM

lars

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From: At my Bar drinking and wrenching in Lafayette Colorado

Chris -
The old Holley spreadbore carbs are no different than the regular Holley carbs, other than the layout of the throttle plates. Metering blocks, metering systems, and the overall carb is the same as any other Holley. As such, it shares the same reliability and performance potential with the other Holley carbs. Some re-jetting may be in order to maximize performance potential for any particluar engine, and the carb responds well to correctly setting up secondary throttle blade angle to balance idle airflow.
Lars

Oct 3, 2005 | 02:06 PM

yellow 72

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From: cincinnati ohio

St. Jude Donor '09

I think Chris69 is asking about the now infamous Holley models 4010 square bore and the 4011 spread bore all aluminum "performance"carbs manufactured in the 80s. I can't find any pics, but they were a two peice design where the top of the carb was removable. Reminded me of the old autolite carbs. I had two of these carbs and was never impressed....

Last edited by yellow 72; Oct 3, 2005 at 03:33 PM.

Oct 3, 2005 | 02:36 PM

Tom454

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From: Raleigh North Carolina

Quote:

Originally Posted by yellow 72

I think Chris69 is asking about the now infamous Holley models 4010 square bore and the 4011 spread bore all aluminum "performance"carbs manufactured in the 80s. I can find any pics, but they were a two peice design where the top of the carb was removable. Reminded me of the old autolite carbs. I had two of these carbs and was never impressed....

That's what it reminds me of as well... the old Ford carbs. If I'm not mistaken, I think Holley made those old carbs for Ford?

http://www.holley.com/data/TechServi...ded%20View.pdf

Oct 3, 2005 | 04:05 PM

yellow 72

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From: cincinnati ohio

St. Jude Donor '09

Here's one......

Oct 3, 2005 | 05:11 PM

lars

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From: At my Bar drinking and wrenching in Lafayette Colorado

Quote:

Originally Posted by yellow 72

Ahh... yes, I know exactly what you're talking about. Disregard everything I said in previous post. I agree with your observations regarding not being impressed.... this is not a performance carb to waste any time or money on.
Lars

Oct 3, 2005 | 06:49 PM

Chris69

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Burning Brakes

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I'm feeling so lucky, once again...

I just finished doing a complete rebuild, and even ordered an electric choke conversion kit last night! Argh.. So, I just have to know...what are the problems with it? I noticed a few 'interesting' design elements during the rebuild, such as no transition slot other than two small holes, the shooters fire through a wall of sorts, metering looks odd, and the PV shoots out of one side of the venturi. Are they hard to tune? Poor transition? Vacuum leak issues? Stupid design?

Speaking of being "unlucky", look for an upcoming Tom454 thread on a stock 427 intake 'eBay deal'...

Oct 3, 2005 | 07:29 PM

yellow 72

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From: cincinnati ohio

St. Jude Donor '09

Mine never gave any hard core problems other than not holding a tune, and anything over 5 lbs of fuel pressure would overcome the needle valves. They just didn't seem to have that seat of the pants ummff.