I can't get my throttle linkage bracket from my 305 to bolt up to the RPM performer Q-jet manifold (#7104). I'm using a Q-jet 4-barrel with this. Anyone have any ideas? Am I'm missing something? I really thought the stock bracket would bolt up because I had a regular Performer EPS on my stock 305, and it bolted up.

 

mine did. It wasn't perfect but I made it fit. I think I stacked 4 washers below the bracket at the back most hole (not the one that is shared with the intake manifold bolt). Then it just rubbed a bit behind and to the drivers side of the carb. Not a huge deal though.

Need a pic or anything?

 

Ya if you have a pic, it would help immensly.

 

ok, so I didn't have a pic of it when it was on my car. I'm currently rebuilding the motor.

So there's 2 bolts, a 5/16" on I think, and the 3/8" one that's shared with the intake rear most bolt DS. The intake one I think I just used one washer, then the 5/16" bolt I think I needed to stack a bunch (4?) of them under the bracket to get the right height. Worked for me.

 

https://webdisk.ucalgary.ca/~jmknopp..._html/carb.jpg

Can you tell me also what vacuum port oa a q-jet I need to connect to the choke diaphram in the picture? I found the timed-vacuum and PCV ports, but there are a million others. I'm trying to get my car running tonight.

In the image, I'm talking about the yellow arrow, although on my q-jet non-cc that thing is near the back on the opposite side of of where it is on that image.

 

ok, your carb has a "rear vacuum break".

I forget what the difference is, I think five7 mentioned it a few weeks ago... Something about locking out your secondaries a different way.

The choke pulloff (aka vacuum break, rear or front, doesn't matter), needs to have manifold vacuum. Not timed (aka ported). So hook up your vacuum gauge and find any unused port that has full vacuum at idle, and that'll work.
I'm using the one that the teal arrow points to there.

anymore questions, fire away. I've had a crapload of problems with my q-jet, the silver lining is that I learned a bunch about them in a pretty short period of time.

 

Uggg, trying to get my car running tonight and it may not happen. I can't hook up the choke pull off to manifold vacuum because I don't have a fitting to plug into the manifold for that right now. Also, having some problems figuring out where the TV cable connects on the Q-jet. I'm pretty sure I found the place where the throttle cable connects. Any good pics of the throttle linkage on a stock car connected to a Q-jet?

 

no, not manifold vacuum as in "needs to be connected to the intake manifold", just means needs full vacuum. Not ported. That's all. Of the 6 or so, 4 are "manifold".
The back one at the bottom (the smaller one, not the one for the brakes), the one with the teal arrow I showed, a higher up one on the front, right above the fuel inlet....


I think I probably had a pic of that in my directory, where the throttle linkage is.... I can't help ya with TV though.

 

Thanks, figured out teh vacuum break thing. Maybe drinking some beer will help clear my head. I'm still working on the damm TV cable now.

 

Hey Sonix,

Thanks for all your help tonight, I figured everything out. Just have to wiring up the electric choke and I'm good to start the car up.

 

good job. oh, and good luck!

 

I might be having some problems with my distributor. I haven't started the car yet, but I'm worried about it being in the right position. I kind of eye balled it from memory lol.

 

that a statement or a question?

If in doubt, it's wrong. Always. Never fails.

Rotate the engine over, with your finger over the #1 plug. It's tricky with 1 person, but do-able. Once you feel the puff of air, watch the balancer, and bring it up to way 10*. Then put in your distributor, so that the rotor lines up with a post. Make that post #1, and go around clockwise in the firing order. You'll probably need a long flat blade screwdriver to align the oil pump drive. Pick the post for #1 based on ease of wire routing. I didn't, I just went with front drivers side, the stock one. My wires were a mess. Anyway, good luck.

 

The front vacuum break is always connected to the vacuum port just above it that sticks out of the airhorn casting, pointing basically downwards at an angle towards the vacuum canister itself.

The rear vacuum break you can/should remove completely. Totally unnecessary for a performance application. All it does is pop the choke open a little further but a little slower than the front vacuum break does when the engine is first fired up from overnight-cold. The primary vacuum break can do the job just fine by itself when properly adjusted. The second (rear) vacuum break I'm almost sure is for emissions reasons, nothing more. I don't even mess with them- they get taken off and nobody misses them.

 

Alright, thanks everone, my car is running...

However, 2 other problems lol. My return spring is garabage, the throttle lever doesn't come back down properly so I will take care of that tomorrow. Also, I'm going to need a new spacer for the air cleaner and a different lid so my hood closes. I'm using the lowest profile filter possible.

 

haha, tearing up the ***** streets on hongcouver yet?

why won't your hood close? gigantic single plane intake?

 

LMAO hongcouver tis true...

Just a Performer RPM Q-jet style, it's taller than the Performer EPS I had before. The lid of the Edelbrock air cleaner seems to hit some random parts of the Q-jet carb at the very top. Also, I tried putting a spare return spring I had that is pretty stiff and the damm throttle seems very stiff, it doesn't come down properly. I might have to talk to the carb shop that built it unless you have any thoughts or recommendations? How friggen stiff of a spring do I honestly need? The gas pedal now feels extremely stiff as it is.

 

hmm, I have that manifold with stock non-cc carb, and stock air cleaner. No foam on the underside of the hood though. Seems to clear fine.

I have the stock dual throttle return springs. My idle speed was excessively high before, and I had to rebend my throttle tang, as the secondaries were hanging open a bit.

 

I don't have the foam under the hood, but I'm using an Edelbrock air cleaner with a K&N filter.

"stock dual throttle return springs"? You are saying you have 2 return springs? I only saw 1 in your pic.

 

it's one inside the other. Two hooks on each end.
not sure how tall your air cleaner is, but mine fits peachy

 

I picked up a Mr Gasket dual return spring today. It's pretty nice and it definately helps, but I think my throttle is just a tad stiff still. I got the air cleaner to fit by using the bottom part of a K&N I previously had with a lower profile air filter and a K&N top. I then had to chop down the carb stud screw about 1" so that I could screw on the nut.

 

Sonix/MKnight: I've been toying with the idea of getting one of these manifolds. Can either of you give me an idea of how much taller the 7104 is verses the stock AL Q-Jet manifold. I have nice poly motor mounts and about 3/8" clearance with the stock air filter. Why is it that when it comes to air filter assemblies there isn't squat available from Summit or Jegs? Most people say "just use one of those early 80's Corvette air cleaners". Lemme see now, there ought to be about 5 of those resting in the junkyard with the engine still in them....
For what it's worth, here's a pic of the accelerator, cruise, and TV cable on my stock Q-jet manifold. Edit: lightened dark pic.

 

I didn't really measure mine compared to the old one. I just put it on and drove, I have no idea my clearance before and after, and I don't hear a "whap" when I close the hood so...?

haha, yea, just snag a corvette air cleaner, it'll be in aisle 14, right after all the chevettes, and before all the cutlasses...

 

Here's what I worry about, picture:

 

wow. That's pretty impressive...
I have no idea how that's possible though, i've got that q-jet, that q-jet manifold, stock power bulge hood, stock air cleaner, and new stock style motor mounts. No sound of anything hitting..?

 

Ahh, power bulge hood. That pic I borrowed from Waxx. looks like what my hood would do, it's a stock '88. How many hoods have you seen with that little 1/4" hole where someone knew the air filter wouldn't fit, left it off, and slammed the hood on the stud?
Maybe Mknight still has his stock manifold and can give me an idea...

 

Nah, I dont' have the stock manifold anymore, I just installed a RPM Perfprmer Q-jet.