Author Topic: Adding a breather to a valve cover (Read 388 times)

Kooter · « **on:** April, 09, 2010, 10:35:43 PM »

I just want to run this buy everyone to make sure I am not missing anything when it comes to adding a breather to a valve cover. It looks like you have to drill the appropriate size hole, install a rubber grommet, and insert breather. Am I missing anything or is it this simple?

silverblueBP · « **Reply #1 on:** April, 10, 2010, 03:51:14 AM »

I added a baffle to keep oil from splashing directly up into the cap.

AzPete · « **Reply #2 on:** April, 10, 2010, 05:40:23 AM »

Add a baffle for sure but not so low that it hits the valves.

blue65coupe · « **Reply #3 on:** April, 13, 2010, 05:12:05 AM »

You're on track. Do what they said with the baffle.

70_Fastback · « **Reply #4 on:** April, 13, 2010, 06:21:33 AM »

What valve covers do you have that don't have a breather provision? Or are you relocating it to the rear on one side?

Kooter · « **Reply #5 on:** April, 13, 2010, 10:33:03 PM »

Thanks for the help guys. I will add a baffle as well. What is the best way to secure the baffle without ruining the outside finish?

Jeremy,
They are trick flow valve covers. http://www.precisionraceengines.com/parts-and-accessories/sheet-medal/bbf-big-block-ford/bbf-ford-racing-aluminum-valve-covers-1.html The guy I bought the heads from gave them to me. One of the covers does not have a hole. I am hoping it will be a quick fix and not eat up to much time while I am home.

Kooter · « **Reply #6 on:** April, 14, 2010, 03:13:31 AM »

Does this type of baffle accept a push in breather?
http://www.summitracing.com/parts/SUM-440332/SuggestedParts/?prefilter=1

Also is there a difference between the open and closed element breathers.

daveSanborn · « **Reply #7 on:** April, 14, 2010, 05:20:27 AM »

Quote

One of the covers does not have a hole.

If one of the valve covers does not have a hole.... then the other valve cover does? I assume that the one with the hole in it is for adding oil and can't be used for a breather port also?

Quote

Does this type of baffle accept a push in breather?

Yes.

Quote

Also is there a difference between the open and closed element breathers.

Yes. An open element breather vents to ambient air pressure and is IMO less effective. A closed element breather vents.... usually through a Positive Crankcase Ventilation (PCV) Valve that is connected either to the base of the carb or to the underside of the air cleaner and is IMO more effective.

BTW, those are very nice valve covers.

cmayna · « **Reply #8 on:** April, 14, 2010, 06:13:23 AM »

Quote from: daveSanborn on April, 14, 2010, 05:20:27 AM

Yes. An open element breather vents to ambient air pressure and is IMO less effective. A closed element breather vents.... usually through a Positive Crankcase Ventilation (PCV) Valve that is connected either to the base of the carb or to the underside of the air cleaner and is IMO more effective.

BTW, those are very nice valve covers.

What I'm doing with Shag is on passenger side, closed breather cap to pcv to carb. Driver's side closed breather cap to air cleaner.