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Old 10-09-2006, 02:38 PM
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vacuum lines sbc..help please!

Hi ,I'm putting a newer intake and Q-jet on older 283 with points and need to figure out the vacuum lines etc. Any diagrams or help would be great thanks...Ken

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Old 10-09-2006, 04:58 PM
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You can start out simple with this set of connections.

1. On the back of the carb is a large threaded fitting - a large diameter metal pipe connects to this fitting and with a large diameter rubber hose to the power brake booster.

2. On the back of the manifold (on the flat area behind the carb) you screw on another metal fitting. From this fitting you will have a medium diameter vacuum line, which then connects to a T vacuum fitting. One side of the T goes to the vacuum line for the auto trans and the other side goes to the HVAC or other vacuum accessories.

3. From the front of the carb you have a small diameter vacuum line that goes to the vacuum advance on the distributor.

4. From the front of the carb there is a larger diameter fitting that will have a line going to the PCV valve on the driver's side valve cover.

5. You might also have a smaller fitting on the front of the carb, for the hose to the fuel vapor recovery tank.

That set of lines should get you running if you don't have any EGR or other emissions equipment.

Bruce
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Old 10-09-2006, 05:44 PM
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Im in the same boat,but my car has the EGR can i just go with the above setup.And how do i block off the EGR,would that affect the motor performance.The engine is a 1981 305 in a trans am.
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Old 10-09-2006, 07:21 PM
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Here's some vacuum lines on my '74 Nova 350. Maybe they can give you an idea until you can find better info.

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Old 10-09-2006, 08:50 PM
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Thanks Guys, That helps fill in a couple blanks I had. ...ken
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Old 10-10-2006, 04:59 AM
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I don't have an EGR on my engine and I don't know exactly how its connected.

I assume the EGR temperature switch (screwed into the manifold?) is connected to engine vacuum (like the connector for the auto trans), and then it applies or removes vacuum from the EGR based on engine load and temperature.

Bruce
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Old 10-10-2006, 06:45 PM
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Look at the intake ports on the 283 heads where the intake manifold meets them. Be sure the ports are the same size as the matching ports in the intake. Some 283's had little bitty intake ports, and a later manifold with "normal" sized ports won't match up.
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Old 10-10-2006, 06:46 PM
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The way your vacuum advance is connected,it will have full vacuum full time. It is bellow the butterflies.Is it correct? What is your initial timing?

Pretty neat and stock engine bay.Keep it up.
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Old 10-10-2006, 07:24 PM
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Quote:
Originally Posted by paulo 1
The way your vacuum advance is connected,it will have full vacuum full time. It is bellow the butterflies.Is it correct? What is your initial timing?

Pretty neat and stock engine bay.Keep it up.
Thanks Paulo!!

It's original except for the HEI I installed but I wouldn't eat off it like I could with some other peoples engines.

I believe the vacuum line is connected correctly to get full manifod vacuum. I don't remember what my vacuum advance/timing settings are though.

Maybe I'll have to check it out next weekend to see where the timing is set. It seems when I installed the HEI I needed to either get a 20* vacuum can or an adjustable one though.

Since my wife drives this one, It don't have to go fast...(it just has to go)
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Old 10-10-2006, 07:41 PM
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OK.I am restoring a '74 Camaro for a client to oem specs.We have a Quadrajet and 4 speed,but no air pump.Maybe because it is an export car.
I will check on my Chiltons and Motors about the vacuum hose routing.
Now it might not be clean,but the sight of an unmolested engine bay is a good thing!
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