i have an 86 z-28 it had the 305 with the 4bbl quadrajet. well i sawpped out the 305 for a 350 and when it came time to out the carb on i had all these vaccum lines that i ad no idea to put. i took out the air pump so that got rid of some lines but where do the rest go? does anyone have a clear and descriptive diagram to show me how to route these lines? is there any way to get rid of the majority of the lines? which are essentials? please help i need to drive my car its drivin me nuts

 

LOL I went through the same thing. All I can say is that I still have my AIR pump.(now I have Edelbrock 600)

 

Try this... I'm not sure what year it's for, but there's not much difference from one to another.

 

that is great... but my only question is what of all that s*&t do i need? what can i get rid of w/o sacrificing power, drivability, and idel? is it true the car will not run w/o the EGR valve? please help

 

Without the EGR, the timing advance will not be proper and you'll get more pinging at loaded part throttle. Or, the knock sensor will be working overtime, which isn't good for performance or mileage.

The EGR doesn't hurt normal operation. EFE is about the only other thing that can be removed without affecting some aspect of performance/operation.

If you have the stock exhaust and air cleaner on there still, those two are hurting you far more than any of the things attached to vacuum lines.

 

what is the efe valve? and what would it eliminate if taken out?

 

Here is the way I have mine. I eleminated quite a bit of it but kept the egr.

 

EFE stands for "Early Fuel Evaporation". It is the butterfly valve in the passenger side exhaust manifold. When the engine it cold, it closes, blocking flow from that side, forcing exhaust flow through the cross-over passage under the intake plenum and out the other head, warming up the intake so fuel doesn't pool. As the engine warms up, the valve opens back up for "normal" exhaust flow.

 

Ha, I knew what it did and how, but I didnt realize why. It makes since now why tpi manifolds dont use this setup now. Since tpi is a "dry" intake setup it doesnt have fuel to pool in the intake manifold. I have a question though. I have a computer controlled carb setup on a 350 and I have long tube headers and eleminated the efe. How will this effect the warm up of the car? Will there be any problems because of this. Also I left the ports for it open from the heads to the manifold. Would I have been better off just to block them since I dont have the valve in the exhaust anymore?

Ben

 

My shorties eliminated the valve as well. I left the cross-over passages open as you did. It seems to warm up pretty much the same as it did when stock, although the thermovac on the air cleaner seems to be more critical (without it, such as when the tube fell off a couple of times, off-idle stumble was worse).

 

How do you have the tube setup without the manifolds because there is no place for it to draw heat from unless you just run it down by the headers.

Ben

 

ttt

 

so i can just plug all of the vaccum outlets? what if i run an after market intake aircleaner? what effect will that have?

also. are fuel injection heads different from carb heads?

 

If you dont use any you plug them, but I wouldnt get rid of everything. I would at least keep the stuff that I have in my modified diagram. I would look into what each thing does before you decide to remove them. They all have some sort of purpose.

Ben

 

what about the senors in the water neck? they have a vaccum hose hook up, are they necessary. what do they do?

can i get rid of them?

 

You do need the sensor with the wires, but you CAN get rid of those vacuum switches but I would research what they do first. I am not sure which one is in the water neck and which one is in the front of the intake manifold, but one is the efe(early fuel evaporation) tvs which controls that flap on your exhaust. When the motor is cold it keeps that flap closed which forces the exhaust to flow through a port in the intake manifold and out the other head. This is to keep the fuel from pooling in the intake manifold when the motor is cold. The other is the purge tvs which has to do with venting the pressure from the fuel tank I believe. You can see the routing for both of them on that diagram and should be able to figure out which is which. If I were you I would do some more research on what effects removing these will have.

Ben