just a quick question

[benno440]

i have dual quad carbs on my 440 and i have power brakes now with the vacuum line from the brake booster do i need to route it to the vacuum outlet on both carbies or just one of the carbs and block the front hole off?

did i explain that right?

 

[Histoy]

Run it to one carb. If you have a PCV valve, it should have a hose to the other carb.

 

[mopar367]

I have always ran the brake booster to a vacuum port on the intake manifold itself. That is how they all come from the factory. I just use the large carb port for pcv.

 

[Meep-Meep]

I would tend to do what 367 says. However, most aftermarket intakes, including the dual quad ones I have seen, have a 3/8 pipe port on the runner so should be a non issue. If you have no access port, which I'm thinking you don't, then doing what Histoy says should work just dandy.

 

[benno440]

yeh theres none on the edelbrock ch28 intake.

the carbs i have are edelbrock they have a pcv port on the front side facing radiator and a vacuum npt hole for the brake booster on the back side, so run a line from booster to hole in back of carb thts closest to firewall then a hose from front pcv port on back carb to the vac port in front carb???


thanks in advance

 

[Meep-Meep]

I'd say that's as good as it gets. You can leave the front carb all capped off.

 

[shag766]

I'd say that's as good as it gets. You can leave the front carb all capped off.

what meeps said is a good way.

 

[benno440]

okie dokie thanks all

 

[coloradodave]

Benno: If I read that right (twice) you said you were going to connect the PCV port on your rear carb to the PCV port on the front carb? Not correct. Connect one of the PCV ports to a closed breather on either valve cover. Cap off the other PCV port. On the opposite valve cover, connect a hose to the bottom of the air filter housing, inside the area that's filtered. Run this way, you are drawing filtered air through the motor, via the PCV valve, and into the intake manifold. The other option is to cap both PCV ports on the carbs and run open breathers on both valve covers.
Advantage of running a PCV system is that it keeps oil vapor off the top of the motor so there's less cleaning involved. No performance gain or loss.

 

[benno440]

thanks i understand now,
i currently already have beathers on my covers so i will just block the pcv ports off.

 

[fatecaptured]

Advantage of running a PCV system is that it keeps oil vapor off the top of the motor so there's less cleaning involved. No performance gain or loss.

I thought the PCV system was to promote a good ring seal and get any gas vapors out of the crankcase so it wouldn't contaminate the oil. But i'm no expert.

 

[coloradodave]

Sorry, I didn't mean to say that the PURPOSE of the PCV system was to keep the motor cleaner, only that it was an advantage to using one. Originally, it was one of the first emissions controls designed to not allow crankcase vapor to escape to the atmosphere, creating a CLOSED system. You got me on the ring seal question.

 

[67 B-body]

Operating without a working PCV system "Positive crankcase ventilation" can lead to unwanted oil leaks throughout the engine.