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Old 04-27-2011, 08:32 AM
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PCV Breathers SBC

Hi everybody...

I just bought a pair of aluminium PCV breather push in style (PCV fitting) to install them in the valve covers of my 307 Small Block Chevy...

Im just curious: is it necessary to install only 1 or 2?

What are the benefits of a PCV breather? The breathers, rubber grommets, elements inside are all i need so my 307 can breathe normally?

The breathers come apart to clean the element inside...

Alex

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Old 04-27-2011, 09:13 AM
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If you've got a PCV on one cover, to the carb, you only need one to pull air into the motor. I used to run two with no PCV but had blow bye in a blower motor, put a PCV on one side, it went away.
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Old 04-27-2011, 09:53 AM
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You need a PCV on one cover and an open breather on the other. 2 PCV's would be fighting each other. Air has to circulate from one side to the other on the engine to work properly.
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Old 04-27-2011, 09:58 AM
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my valve covers both do not have any holes, they are the closed aluminium welded (fabricated tall valve covers) and notice there was oil near the intake...see pics attached...

I want to install them both one on each valve cover? will these make my engine to breathe better?
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Old 04-27-2011, 01:25 PM
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i know i have to make the holes on the valve covers...

I have a Holley street avenger carb 670 cfm 4150...do i have to connect a hose from the PCV breather to the carb?

help please....
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Old 04-27-2011, 01:35 PM
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The carb is usually where it hooks up at, But where ever you hook it it's got to be a good source of vacuum "FULL TIME" the carb is the best place but not the only place as long as it constant.JMO
Where are you wanting to hook it up at does the carb have a place for it ?


Cole
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Old 04-27-2011, 02:22 PM
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Hi Cole, thanks

but my answer still has not been answered, do i have to connect a hose from the pcv breather (in the valve cover) to the carburator?

If yes, where in the carb? my carburator is a Holley Street Avenger 4150 670 cfm electric choke ...

Help please...
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Old 04-27-2011, 02:33 PM
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Quote:
Originally Posted by alexcamaro307
Hi Cole, thanks

but my answer still has not been answered, do i have to connect a hose from the pcv breather (in the valve cover) to the carburator?

If yes, where in the carb? my carburator is a Holley Street Avenger 4150 670 cfm electric choke ...

Help please...
Yes. large port on the carb base (probably only one) that hooks to the brake booster can be Tee'd into. If those caps realy have a built in PCV vale in them you only need one and an open breather on the other cover. This will ventalate the cranckcase well enough. If those caps are just breathers and no PCV valve in them you'll just suck oil out the covers and create a big vacuum leak for the carb. How about some info on those caps?
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Old 04-27-2011, 02:34 PM
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To answer your question.

Quote:
Originally Posted by alexcamaro307
Hi Cole, thanks

but my answer still has not been answered, do i have to connect a hose from the pcv breather (in the valve cover) to the carburator?

If yes, where in the carb? my carburator is a Holley Street Avenger 4150 670 cfm electric choke ...

Help please...






Yes there should be a place on the front of that carb at the base plug it in there. If not then you will have to add a port to the intake and get the vacuum needed for the pcv to work properly. JMO


Cole
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Old 04-27-2011, 08:35 PM
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Ive also heard of guys running a PCV line from the breather on the valve cover to the headers as well, Ive never done this but always heard that it was a better way for the PCV so the junk from the bottom of your motor does not go back into your engine to be burned off in the cyclinder, instead it gets blowed out through the exhaust.. any insight to this idea
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Old 04-27-2011, 10:35 PM
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I've seen that on race only setups, IM folks would frown on it.
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Old 04-28-2011, 12:20 AM
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i kind of thought the same way, its more of a race setup only i thought
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Old 04-28-2011, 07:47 AM
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Quote:
Originally Posted by eloc431962
Yes there should be a place on the front of that carb at the base plug it in there. If not then you will have to add a port to the intake and get the vacuum needed for the pcv to work properly. JMO


Cole
Here's a page of the Holley manual of my carburator, and also a picture of my carb. I marked the PCV inlet in the carb, that's what i think the hose can be hooked in...

Is this the correct PCV inlet to hook up the hose from the PCV breather?
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Old 04-28-2011, 10:23 AM
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Quote:
Originally Posted by alexcamaro307
Here's a page of the Holley manual of my carburator, and also a picture of my carb. I marked the PCV inlet in the carb, that's what i think the hose can be hooked in...

Is this the correct PCV inlet to hook up the hose from the PCV breather?
Being your manual points to the port as a PCV connection, I would say that it is the correct port to hook it up too.
It is nice that your 670 comes with two ports unlike some Holley's that only come with one.

You still haven't answered my question, Does what you call a PCV breather really have a PCV valve built into it? or is it just an open breather with a hose connection on it?
The reason I ask is if it's just a breather without a built in PCV valve, you going to end up sucking up oil into the carb base and will create a vacuum leak to the carb. Another thing that has to be addressed is the location on the valve cover where you mount the breather cap. without a baffled port under the cap, the breather will have to be positioned between the rockers to keep from being splashed with oil from a rocker arm and you need clearance from the rockers also. All this has to be taken into consideration before you commit yourself to where to drill the hole into the valve covers or your going to have a problem. Your engine looks real nice, don't screw it up.
Another thing I noticed is where do you put the oil in at?
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Old 04-28-2011, 11:08 AM
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i'm asking the guy who sold me these PCV breathers if these have a PCV valve built in, i start to regret about having these valve cover style...

Since my valve covers don't have any baffles inside, where can i drill the holes in the valve covers?

As for the oil filling, i will put oil in the other valve cover oil breather...

About these pcv breathers, the ad says:

STD push-in type with grommet (included)
-PCV Fitting.

-CNC-Machined.
-Polished to a beutiful shine.

-For use in High Performance engines.
-Made from Billet-Aluminum
-Cleanable filter.
-EXTREME DUTY.
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