Valve cover breather help
Thread Starter
Racer
Joined: Sep 2009
Posts: 310
Likes: 0
From: London
Valve cover breather help
Hey,
Im just looking for a breather for my valve cover, i dont have the car around to measure the size of the hole and i would like to be able to order the part before i get to be around the car again...
Here is a pic of my valve covers, they are standard GM covers.
I think the hole is 1-1/4" but id like to make sure.
Thanks a lot.
Also, do i need to take the cover off to take the tube out? Is it screwed from inside or can i just pull it out and push the breather in?
Im just looking for a breather for my valve cover, i dont have the car around to measure the size of the hole and i would like to be able to order the part before i get to be around the car again...
Here is a pic of my valve covers, they are standard GM covers.
I think the hole is 1-1/4" but id like to make sure.
Thanks a lot.
Also, do i need to take the cover off to take the tube out? Is it screwed from inside or can i just pull it out and push the breather in?
Last edited by Carlos840; Jul 19, 2010 at 03:39 PM.
Thread Starter
Racer
Joined: Sep 2009
Posts: 310
Likes: 0
From: London
I am just afraid its going to suck in some crap in the engine and id rather swap it for a push on breather!
I am going to keep the PCV as it is though.
Dont know if its actually bad to not have a filter on there, but i guess its there for a reason!
Last edited by Carlos840; Jul 19, 2010 at 04:28 PM.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The hose that goes into your air cleaner will serve as the "breather". If you get any blow-by out of that hose, it will show up as oil stains on the air filter by that hose. Putting another breather into those LT-1 covers would be a waste of time and money.
Thread Starter
Racer
Joined: Sep 2009
Posts: 310
Likes: 0
From: London
I know that, im not trying to add another breather!
I am just worried that the hose without a filter ( its NOT going into the air cleaner, and cannot go into the air cleaner) will let unfiltered air into the engine and cause problems...
I just want to swap the hose for a breather with a filter!
Is it worth doing or is the fact that i dont have a filter on this hose not a problem?
I am just worried that the hose without a filter ( its NOT going into the air cleaner, and cannot go into the air cleaner) will let unfiltered air into the engine and cause problems...
I just want to swap the hose for a breather with a filter!
Is it worth doing or is the fact that i dont have a filter on this hose not a problem?
Last edited by Carlos840; Jul 19, 2010 at 05:57 PM.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
That unfiltered air is not going into the intake manifold and valves...it's only going into the interior of the engine. Unless you are in a sandstorm, that shouldn't be a risk. The original setup had the hose going into the air cleaner housing...but it wasn't filtered either. If you feel better about it having a breather, knock yourself out.
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 99
From: Ontario
Just pull the tube out and push in one of these (or similar brands).
http://www.jegs.com/i/Mr-Gasket/720/...oductId=746269
http://www.jegs.com/i/Mr-Gasket/720/...oductId=746269
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Burning Brakes
Joined: Aug 2005
Posts: 1,164
Likes: 1
From: Europe, France
Or those Edelbrock Elite aluminum breathers:
http://www.summitracing.com/parts/EDL-4214/?rtype=10
They even have the grommets included and they fit perfectly the stock valve covers.
http://www.summitracing.com/parts/EDL-4214/?rtype=10
They even have the grommets included and they fit perfectly the stock valve covers.
Thread Starter
Racer
Joined: Sep 2009
Posts: 310
Likes: 0
From: London
Just pull the tube out and push in one of these (or similar brands).
http://www.jegs.com/i/Mr-Gasket/720/...oductId=746269
http://www.jegs.com/i/Mr-Gasket/720/...oductId=746269
I saw loads of breathers like that but they have a lot of different sizes!
Most of them are 1-1/4" and most after market valve covers have 1-1/4" holes!
I just wanted to make sure that original GM valve covers have a 1-1/4 hole, thats it!
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 99
From: Ontario
That is exactly what i want to do, my question was " what is the size of the hole"...
I saw loads of breathers like that but they have a lot of different sizes!
Most of them are 1-1/4" and most after market valve covers have 1-1/4" holes!
I just wanted to make sure that original GM valve covers have a 1-1/4 hole, thats it!
I saw loads of breathers like that but they have a lot of different sizes!
Most of them are 1-1/4" and most after market valve covers have 1-1/4" holes!
I just wanted to make sure that original GM valve covers have a 1-1/4 hole, thats it!
That crankcase intake does have a plastic and gauze filter (in white) where the intake is outside the normal air filter (as shown). Hence the push-in type I suggested above. On my old 1967 327/300 the intake spout was inside the diameter of the air filter and had a spark arrestor but no filter (the normal filter did the job).
The hole is 1 1/4".
Last edited by Paul L; Jul 20, 2010 at 10:22 AM.
Thread Starter
Racer
Joined: Sep 2009
Posts: 310
Likes: 0
From: London
Two points.
That crankcase intake does have a plastic and gauze filter (in white) where the intake is outside the normal air filter (as shown). Hence the push-in type I suggested above. On my old 1967 327/300 the intake spout was inside the diameter of the air filter and had a spark arrestor but no filter (the normal filter did the job).
The hole is 1 1/4".
That crankcase intake does have a plastic and gauze filter (in white) where the intake is outside the normal air filter (as shown). Hence the push-in type I suggested above. On my old 1967 327/300 the intake spout was inside the diameter of the air filter and had a spark arrestor but no filter (the normal filter did the job).
The hole is 1 1/4".
Do you know if i can just pull on the hose and get it out with the grommet without taking the valve cover out, or do i have to take it off and get it by the inside?
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 99
From: Ontario
I just pulled the steel tube out of the grommet for the pic. The grommet comes out with a little help/squeeze from a screwdriver. On the bottom side is a lip that has to be released. (Be careful not to put excess pressure on the aluminum.) But the grommet should pop out quite easily.
