Carb/Intake Installation

[B-Co Kid]

Hey guys.  Looking at other forum posts, im not sure if my carb vacuum lines are attached properly.  Real quick, 87' B-Co, 351w, C6 trans, holley 570 street avenger, edelbrock performer intake, no EEC or computer.  here are a couple pics of my set up.  The connection in question is from the carb to the pcv.  Should this vacuum run to the port that is plugged at the rear of the intake? (see photo).  There was a ported switch there, but i plugged it.  The problem that i have been having is that there is a hesitation/miss on take off.  I have set and reset the timing from 10 degree up to 15 degrees btdc, i have adjusted the mixture screws to maximum vacuum (which is approximately 19 mmHg at idle and 15 mmHg in gear), nothing has solved this hesitation/miss on take off.  Also, after the B-Co has been driven a few mins, and then cools off, It takes a couple of tries to restart the engine (im sure its not the coil).  Any help would be appreciated!!

 

[Seabronc]

Brake boost should go to Main Vac port on the back of the intake manifold. Is the port you are using at the bottom of the Carb in the front of th carb?.  Pictures are too close up to see the installation very well.  If that is the front, the large port is usually used for the evaporative vapor purge system.

The vacuum advance hose looks to be hooked up to the proper port.  Can't see where the PVC is hooked but a large port under the carb will do..

The hesitation is most likely the excellerator pump adjustment.  It will hesitate if it doesn't pump enough gas in when you stomp it and it will hesitate if it pumps too much gas when you stomp it.  I'm not familliar with thar carb, but if it is a Holley there are some linkage and cam adjustments on the rod that operates the pump.

Good luck,

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Post some pictures thar show the whole carb, one of each side.

 

[B-Co Kid]

Referencing the picture i previously posted, the connection from the carb to the brake booster is on the rear of the carb. So, as you suggested, the brake booster should receive its vacuum from the port at the rear of the intake...I will unblock that port and and run it to the brake booster.  My next question is, once i make that change, that leaves the port on the REAR of the carb open, do i block that off, or what should that port, on the REAR of the carb be connected to??  Also, the new picture shows the connection to the PCV on the valve cover.  Is this connection correct (carb to PCV)??  Here are additional photos

 

[Seabronc]

Referencing the picture i previously posted, the connection from the carb to the brake booster is on the rear of the carb. So, as you suggested, the brake booster should receive its vacuum from the port at the rear of the intake...

As long as that blocked port on the manifold is not a water jacket tap.  

Do you have a vacuum tree to put in the intake?  I would then put a vacuum tree in it that has more than one tap.

Usually the tree connections are top large tap to booster.  A smaller tap on the tree to the transmission.  PCV valve to a large port at the base of the carb, usually the rear of the carb.  The front large port on the base is usually used for the evaporative emissions purge system.  If you don't have the purge control system then the PCV valve can use the front or rear large port at the base of the carb, cap off any unused ports at the base of the carb or on the tree.  You can get caps at allmost any auto supply. 

The vacuum advance connection looks good.

Was the engine cold when you took the pictures?  The reason I ask is that the choke plate is partially open.  When cold, it should be closed.  Did you do the choke adjustment?

Another good reason for installing and using a vacuum tree is that you may need a place to suply other things with main vacuum. ie. the vacuum reserve tank which prevents you from having problems with the heat/air vents since they are vacuum operated.  Plus you will have a cleaner looking installatin for your vacuum lines.

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[B-Co Kid]

Thanks for the good info seabronco.  I think i will make the changes that you suggest and go from there.  The engine was cold when i took the pictures, I am having a problem with the choke plate sticking for some reason.  There have been times where it is wide open when starting cold.  Ive read on how to loosen the cap on the electric choke and twist up/down a notch or two, but i havent really tinkered with that yet.  I have been considering the edelbrock thunder AVS series.  Saw a video where the slight hesitation at take off, for holley street avengers, is because of some spring rubbing on the accelerator pump or something, cant remember. Im not much of a carb guy, except for what ive learned recently trying to tune my 570.

here's the link explaining the bog http://www.youtube.com/watch?v=gXLrhE5tGMo

 

[Seabronc]

I'm not familliar with the Street Avenger, but it looks like he has hit it on the head.  No injection from rhe pump will definately cause the problem.  Here is a choke video from YouTube

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