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Old 06-23-2003, 09:13 AM   #1 (permalink)
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PCV Valve or 2 breathers?

I bought a new set of valve covers for my 68 302. They have one breather in each valve cover. Will that be enough crankcase evacuation or do I need to run a PCV valve out of one of the valve covers?

Also I swapped carbs/intake from a 2V to a 650dp. I had a hose running from the carb to the PCV valve in the valve cover before. Do I need to do this again with this new carb? Or will it breathe enough?
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Old 06-23-2003, 09:42 AM   #2 (permalink)
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PCV Valve or 2 breathers?

HI
I my self like the PVC. With Just the breathers you will get some oil mist comming out of the breathers and make a mess of you valve covers If you start getting any blow by just because of running it hard.
Just my .o2
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Old 06-23-2003, 09:46 AM   #3 (permalink)
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PCV Valve or 2 breathers?

If your fire wall is not perfectly sealed, those fumes coming out of the breather tend to enter the interior and give you a headache. Not so with a PCV.
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Old 06-23-2003, 10:17 AM   #4 (permalink)
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PCV Valve or 2 breathers?

I'm running a PCV on the passenger side cover to the rear of the carb and a open breather on the other. I made a 1/8" orifice and put it in the PCV hose to limit the vacuum from the carb. I've had no fumes or oil leakage so far.
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Old 06-23-2003, 10:28 AM   #5 (permalink)
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PCV Valve or 2 breathers?

I have been running with 2 breathers for over a year now after I put on my 4 barrel. No problems, rarely I have to wipe some blowby off of the valve cover, but that is once in a blue moon.
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Old 06-23-2003, 11:11 AM   #6 (permalink)
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PCV Valve or 2 breathers?

Absolutely use a PCV! Put it in the corner of one cover and put the breather in the other caddy corner to the PCV for proper opperation.

Race engines don't need them because they don't run for long periods and get very high maintenance unlike a typical street motor.
A PCV will add life to your motor and do will help keep the oil clean. Other wise your oil will get contaninated quicker from combustion products.

Even in the days before PCV's the auto makers used "road draft tubes" wich was a tube the went down to the road. As the vehicle moved down the road, the low pressure area under the car would suck the fumes out of the engine.It would work exactly like a venturi on a carb.

IMO, there's absolutely no reason not to run a PCV on the street. I grew up in the era of road draft tubes...it was no fun being behind someone with a tired motor with poor ring seal and being engulfed in a cloud of smoke! You should have seen how bad some of these cars were!
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Old 06-23-2003, 12:22 PM   #7 (permalink)
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PCV Valve or 2 breathers?

I agree with huskinhano, absolutely run the PCV unless it is a race car only. I've tried to run my car with out a PVC & used dual breathers on my valve covers. No matter how much I tuned the carb & tried to compensate; the car just plain ran better with the PVC installed. Crankcase pressure would build up & blow my dip stick out of the tube a couple inches without the PVC on my street\strip car...
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Old 06-23-2003, 03:52 PM   #8 (permalink)
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PCV Valve or 2 breathers?

Helmantel's comments are true too - without positive ventilation you're going to be dying from the smells coming out of an open emission set up. You won't want to drive the car for any length of time.
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Old 06-23-2003, 04:50 PM   #9 (permalink)
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PCV Valve or 2 breathers?

So do I need to route a hose from the 650dp to the PCV valve?
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Old 06-23-2003, 05:04 PM   #10 (permalink)
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PCV Valve or 2 breathers?

You're best bet would be to route it right into your intake manifold - there is probably a fitting on the back left runner(passenger side). You could also route it into the carb base plate inlet (below the butterflies) but I think you'd be better off to go right into the manifold. Then, just make sure you have a breather cap on the other side, opposite corner, to complete the circuit.
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Old 06-23-2003, 08:49 PM   #11 (permalink)
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PCV Valve or 2 breathers?

If your carb has a PCV fitting, it should be plumbed into it instead of using an intake runner to draw the vacuum from. Drawing from just one of the runners will make that cyl. too lean.

I have my 408W running now (with some minor carb issues but being solved in time) and it has a PCV setup. I'm running FRPP tall black valve covers. The PCV valve is plugged into the pass. valve cover and has a hose going to the PCV fitting on my 870cfm street avenger carb, the driver's side has a breather that doubles as the oil cap fill. That is usually how it's done.
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Old 06-23-2003, 10:42 PM   #12 (permalink)
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PCV Valve or 2 breathers?

I had a PCV hooked up, and my dad disconnected it cause he thought it was worthless. But he capped the exhaust half. Then the intake, became the extake, and i think it was the reason why my right side has less compression and ticking lifters.

I redid it and not only do i have less blowby that i notice and less oil comsumption. In my opinion i think i'm gonna have to go with a yes, use the PCV.
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