I have a 750 Holley carb with vac secondary. When trying to install it, the accellerator pump hits the intake on the back and it won't sit flat. So ordered a spacer, actually 2 different ones now and they don't match the base of the carb. At the front of the carb, it doesn't match so there will be a vac leak. The current spacer I have is from TD Performance (part TRD-2084). It says for square bore Holleys... so what gives?

What series is my carb? Has anyone else had this problem finding a spacer that fits?

Thanks
Robb

If your carb is a 3310 (750 vac) then any square bore spacer should work, I would think.
Whats the # on the carb?

Look on the end of the choke horn for the "list" number for your carb. It sounds like you may have a 50cc accl pump which could be replaced with a stock one to resolve your problem.

I have a question though, it sounds like you are saying the fuel pump is in the back towards the firewall. "...the accellerator pump hits the intake on the back and it won't sit flat" It that is so you have a double pumper or your carb on backwards. ;) Post your list number and let us know what manifold you are running...

Well I called it the excelator pump based on what a friend said when I explained my problem. It may not be the excelerator pump. There is a small cover (black I think) with four screws holding to the underside of the carb under the bowls (front and back). The center of these are round and look to me like a diaphram or vac of some sort. I'm going off memory here since I'm at work.

The carb is on the right way. Linkage and fuel lines are in the right spots.

Spacers have the same footprint from one side to the other right? There's a front and back to their shape, but is there an up or down? The spacer is still shrink wrapped to the cardborad packaging but I can hold the carb up to one side. There is only one way the the bolt holes will line up and there is still a 1/8 inch or bigger gap under the front.

Please continue to offer your suggestions. I will look for numbers & details tonight and have some info in the morning. Thanks again. This is the best site on the web graemlins/thumbsup.gif

Thanks
Robb

Here are all of the numbers that I can find on the carb... right in front of the choke on the side if the bowl there's a number: 12R-10552B On the black plastic part of the choke: 34R-10880B Then above the butterflyes facing forward: R84011 (2219 is right below it)

Can you tell from these exactly what carb I have. I bought it at a swap meet so I'm going on what I was told by the seller (who has a good rep)

I looked at the fit on the spacer again last night and there is a strong 1/8 inch gap along the front. The gaskets are squarer along the outer edge of the spacer and would cover this, but there would be nothing out there to jam the gasket. If the spacer was straighter across between the bolt holes it would fit.... I'm stumped.

Please help me out here, cause I going to return the spacer and order another one later today if I can't figure it out. Based on the pictures on the Summit web site, a plastic (phenolic - sp?) spacer looks squarer across the ends.... worth a try?

Please help..

Thanks
Robb

Robb - I can't find anything on the numbers you posted. Check out this site http://holley.com/HiOctn/TechServ/TechInfo/Instruct.html it may help you find the list number. Here's a carb chart once you have the list number.

Any chance you can get a pic or two?

DjD

Based on that the number on the right side of the choke air horn (R84011) as seen in figure 2, I have a 4011 series carb. I can't find any info on their site saying what this carb is.

And by the way, using the diagram for this model, it was the Power Valve Cover on the rear of the carb that was causing my clearance problems.

What have I got here???

Robb

I forgot to link the carb list page, it's http://holley.com/HiOctn/ProdLine/CarbList.pdf

I looked up 4011 and it's either a 650 or 800. From the exploded diagram it's also a spread bore (larger secondary throttle bores and smaller primaries...) that's why your spacer plate doesn't fit. They make a spacer/addapter to put a square bore carb on a spread bore manifold. I don't know about the other way around. You need something so the PV cover can clear the manifold. Maybe you can use that addapter upside down, I don't know for a fact. I also don't know anything about that design carb. any idea what it was off of?

DjD

Looked at that carb list. The diagram must be used for different models as my carb is a square bore.

The inner hole of the spacer clears the throttle blades, etc... it's just the outer shape doesn't match the spacer.

Why do I always end up with an odd-ball???

Thanks
Robb

Damn, I haven't got a thing done this afternoon because of this. I seem to find conflict info when looking for this part number...

http://www.holleycarbs.com.au/holley.html

This site lists the following:
R84011 HOLLEY 750 4010 SQ.VAC.M/CHOKE

Another site mentioned the carb as a marine application. :confused:

What the hell is this thing and where do I get a spacer that fits??? graemlins/angry.gif :mad: graemlins/clonk.gif

Robb

I've got the same carb and had the same problem with my Performer RPM manifold. I purchased a heat spacer (I call it) gasket. It's a thick paper gasket (about 1/4" thick) with four phenolic grommets - one in each corner. With the manifold I've got, the big 1" spacers wasn't needed and caused clearance issues with the hood.

-dnult

You know the obvious thing to do was/is to call Holley Tech. up and ask them just what you have for a carb.!!

Are you trying to run a square based carb. on a Performer-like intake that is made for the Q-Jet pattern b/c if so then you need the "plate" that goes with the intake that seals the non carb./manifold contact areas as stated in their instructions..

Not trying to be critical here but you may want to really consider finding out what carb. you have so that later if you ever decide to rebuild it you will know what kit to get...

pdq67