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 Found!: Holley 84016/84017 (84015, maybe) 
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Joined: Mon Dec 29, 2014 1:26 am
Posts: 433
These are 4011 series spreadbores.
84016 650 mech
84017 800 mech
84015 800 vac

Summit bought the squarebore 4010 design, but aren't making any of the spreadbore versions and 4011s are terribly scarce on ebay. Interested in complete carbs, NOS/reman/cores/whatever or spare hard parts like throttle shafts or clusters.

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Fri Mar 06, 2015 4:28 pm
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Joined: Mon Dec 29, 2014 1:26 am
Posts: 433
Thanks to ebayers who don't even know how to find the list# on a carb, I got both an 84016 and 84017 for far too cheap.

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Sun Mar 15, 2015 6:18 am
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1704
Good job, you lucky dog. I like these carbs but they are too much work to make them right. There is a couple of incantations of these and one of them has the main well and idle bleeds exactly backwards. It is really too bad because this could have been a good carb for Holley if they had got it right. The big problem is the float level relative to the pullover point in the cluster and the holes in the emulsion tube. Somebody didn't notice they were moving the cluster vertically in contrast to the same or similar cluster in the Autolite/Motorcraft.

The bleed over the main well is a good example of how a larger main well bleed will make a richer A/F at low flow. I think it was a '68 390 (FE eng.) 2bbl that had a little flat spot coming off idle and picking up the throttle after coasting at low speed and the factory bulletin for fixing this if no other normal things had the desired effect, accelerator pump, float level, etc. advised drilling the main air bleed, the one outside the emulsion tube (the fuel goes up the center of the tube to the booster nozzle, the bleed is over the fuel in the main well outside the tube). You just touched it one drill size, .052" to .056" I think, and that richens it up by increasing the pressure difference between the booster and well so more fuel is pushed up the discharge (emulsion) tube.


Wed Mar 18, 2015 12:09 am
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Joined: Mon Dec 29, 2014 1:26 am
Posts: 433
I have a thread about that over here--> viewtopic.php?f=25&t=775

There's a bunch of different ways to go about 'fixing' the emulsion tube screwup, need some guidance there. I have the 650 & 800 DPs and 4-5 vac sec carbs to rob for parts. Also have .014"-wall brass in the correct sizes to make new emulsion & idle tubes.

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Wed Mar 18, 2015 2:00 am
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Joined: Mon Dec 29, 2014 1:26 am
Posts: 433
Here is a R84022, 800 CFM, vacuum, electric choke, marine carb. Mis-listed as a 650 and using the meaningless casting number instead of the list#. I sent the seller a note so those errors may be corrected eventually... or maybe not.

http://www.ebay.com/itm/331510278597

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Sat Mar 21, 2015 12:09 am
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Joined: Fri Mar 01, 2013 3:32 am
Posts: 10
I have kept a 650 DP spread bore just for testing on the dyno in place of Q-Jets. I get a few Q-Jets that never work on the dyno. It is old and not a perfect carb by any means and could use a "tuner tuneup" to be perfect. It does tell me if I have a bad Q-jet or a bad engine. That usually settles a customer down. I have always wondered about using one in a throttle stop situation where you need just a little ET killed.


Wed Mar 25, 2015 6:17 pm
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