i have a holley 4160 4bbl and a quadrajet manifold. o n a carb adapter kit frm spectre. howd u guys mount your carb setups. i rele cud use sum advise on this lol

[This message has been edited by jaredmurray88 (edited 09-21-2011).]

My advice is to learn to spell. Your coming across like a moron.

If you have the carb, the manifold, and the adapter it really isnt that hard to figure out. You mount the adapter to the manifold then the carb to the adapter. Your gonna have more work in tuning the carb so if you cant get this one you might want to let someone experienced do it for you or even show you how to do it.

-Joe

quote Originally posted by thx569: My advice is to learn to spell. Your coming across like a moron.

you might want to work on your grammar bud i was in a hurry because my old lady wanted to use the laptop lol
btw its you're

the issue isnt really the mounting. that part is kinda idiot proof. its that the 4 bbl has a set of ports in the middle of the bottom side and idk waht they are for or if the fact that the adapter is open (no sealing surface in the middle) if this may effect the operation of the carbs and how i should go about mounting them. and also i need some ideas on how people mount their cables and such

nm

[This message has been edited by buddycraigg (edited 09-19-2011).]

Set of ports in the middle of the bottom, not sure what you mean
Maybe a pic would help. Since you say there's no sealing surface in the middle I assume you mean between the primary and secondary throttle plates? This is normal, they do not need to be separated from each other below the carb.

Fuel and throttle lines should be really simple to mate up, you can just about use the hard lines from
The fiero and use rubber to the carb, and they sell kits to use an existing throttle cable on the carb.

[This message has been edited by joesfiero (edited 09-19-2011).]

Best place to research what you want to know is www.hotrodders.com

Membership is free.

Arn

4 bbl carbs have 4 butterflies....2 primaries and 2 secondaries. On some, their different sizes. You need one that matches the openings in the manifold. Some will have 4 same size holes, some 2 small and 2 larger. Some are also just wide open. You may need an adapter to make it open for all 4 butterflies to open fully. I also suggest a fiber or wood spacer under the carb to keep engine bay heat from affecting the running. Mine boiled fuel out of bowls when driven in traffic so it stalled, wasnt a problem driving down the road. The spacer cured it completely.

As for linkage, you can buy kits at Jegs or Summit for a few bucks that fasten on the carb base to allow the correct hookup for your stock cable. Only other things to do are connecting fuel line and choke setup (manual or electric).

First, if you have a dual plane manifold (4 Holes), You obviously have the Wrong Adapter ! you should have the one with 4 holes ! everyone sells the cheaper 1 big hole adapter, really only good for a spacer on a single plane manifold. but you Can get the correct adapter with 4 "Tapered holes" for going from the spreadbore to the square bore of the holley. that prevents the dead spot that the single hole adapter will cause.

He has a Spread bore manifold and a square bore carb. I had the same setup on my 86 SBC Fiero. I used a square bore moroso plate between the carb and manifild - it was open square bore - not a four hole plate. Worked fine but I was using an Edlebrock carb versus a Holley. I am in the middle of building another 350 with the same setup - spreadbore performer manifold with a Holly squarebore carb. I'm using a "phenolic" (plastic) spacer that is squarebore - not four holes. I understand what you are asking about the porting on the base of the carb. I have asked the same question over on Hot Rodders .com - awaiting replies now. I am not sure if these ports need to be sealed with a 4 hole plate or not. Throttle cable bracket was a modified stock GM/Qjet bracket and a stock 4 cylinder cable.

many thanks kat that is what im asking about!!! keep me updated on what you find out about those ports. and jw WHAT IS IT FOR?!!! anybody i ask either has an edelbrock, qjet or sticks to fuel injection

Porting on the base of the carb, you mean the butterflies right? There doesn't need to any separation of the ports, or barrels after the carb. The intake manifold is wide open right? Those 4 ports should be the primaries (2) and the secondaries (2) and should open when under throttle. The butterflies control the air flow into the intake, after those butterflies the air/fuel no longer needs to be separated from primary/secondaries it all flows together in the intake.

Unless I'm confused on what you mean by ports, in which case a pic would help.

-Joe

id post a pic but my pip is screwed up and internet is slow anyway but on a 4160 there is a port in the middle of the four butterflies and i cant make heads or tails of it. it kinda looks like just a vacuum port but i figured id ask first

Katatack, I have a q-jet manifold & an AFB, using a 4 hole taped adapter that adapts the big holes to little, little to larger ,Etc.

The entire underside of the carb can be open to the manifold, or it can be mounted to a four hole intake manifold, does not matter to the carb. There are channels in the underside of the carb baseplate that equalize vacuum between the barrels. Just make sure that the butterflys clear the manifold/gasket/adaptor.

Well I have 2 different answers - which one is correct???? I really do not know but I will tell you what I think. The Holley base plate has ports in it running between the primaries and the secondaries - look like to me they are vacuum ports for PVC, vac advance, etc. One guy tells me it does not matter if they are wide open and another tells me that if it did not matter, why would they be proted to the primaries and the secodnaries. I beleive they are ported to the bores so that if it is sealed to a 4 hole plate or manifold, you still get vacuum on the various ports. But just maybe, the proting is such that it requires the seal to create the correct vacuum in the ports? So, for me, I went and picked up a 4 hole spacer from Moroso and will use a 4 hole gasket matched to my baseplate and mount the carb as designed - to a four hole base - either manifold or plate. Here's some pics:

Holley 4160 600 CFM Vac seondaries


Edlebrock Performer 750 CFM


Square bore - open phenolic spacer


Moroso 4 hole square bore phenolic spacer


After picking up the Moroso spacer, I fit it to the manifold and it seems to make a better seal to the spreadbore manifold than the open square bore spacer - the side walls are a little thicker - and I know for sure it fits the Holley - it's 4160 specific.

To the OP, in my opinion, you should pick up a 4 hole plate/spacer and go that route with the Holley - it may not make a difference - then again, it may make a lot of difference in vac pulse - maybe idle, etc. It was designed that way for a reason - why re invent the wheel.

Like I said above. I had a 600 Eldebrock - brand new on a performer spreadbore manifold with a squarebore - open plate and I could not get the thing to ever idle the same - constant idle changes. I replaced it with a stock Q jet and all those idle issues went away? The Eldleborck was crisper but the Qjet was way better on the top end - I believe that was due to the Qjet being a 670 CFM versus the 600 CFM of the Eldebrock. This will be my first Holley so I just do not know for sure but in the next few weeks, I will as I have both spacers and will try them both.

Again, it does not matter what is under the carb. The channels on the underside of the carb are there so that vacuum is equalized when the carb is mounted on a four hole manifold or adaptor, as it would nomally be on an open manifold.

The ports machined on the bottom go to vacuum ports on the side of the carb. These are termed as full vacuum ports. Generally ports below/under the throttle plates are full vacuum ports. Ports that are sourced above the throttle plates are termed as ported vacuum. Depending on the vacuum required determines which port is used. Example: Vacuum advance uses ported vacuum. Power breaks use full vacuum.

The ports on the bottom of the carb's are designed to use either style of gasket. Using a 4-hole style or the open style will not affect the vacuum ports.

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thank god! for awhile i thought i was gonna have to fork out for another freakin adapter lol. thanks all. btw kat if i were you id try the open first and if it dont work take it back or ebay it lol. im a little envious that your holley has a nice shine and all new, but i guess what do you expect mine was free!

[This message has been edited by jaredmurray88 (edited 09-24-2011).]