Best way to install breathers in these Valve Covers - Chevelle Tech
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post #1 of 17 (permalink) Old May 4th, 19, 9:11 PM Thread Starter
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Best way to install breathers in these Valve Covers

I have always loved the look of these covers, both the natural and black. Hard to believe they have no baffled breather holes in them. What would be the best way to go about putting them in ?I have seen breathers in the front or back of a valve cover with an AN type fitting but not quite sure how they are plumbed in and obviously need a hole to put oil in.


https://www.jegs.com/i/Chevrolet-Per...71244/10002/-1
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post #2 of 17 (permalink) Old May 4th, 19, 9:21 PM
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I have those exact valve covers. Didn't do anything fancy and used I think moroso "baffle" grommets.I just figured out what size hole I needed to drill and used these:
I do still use oil through the pcv system with these but that's if I'm cruising at a constant 3400 to 4000 and why I want an overdrive.https://www.summitracing.com/parts/m...xoCRSgQAvD_BwE
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post #3 of 17 (permalink) Old May 4th, 19, 9:26 PM
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Bruce
 
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Re: Best way to install breathers in these Valve Covers

I'd eyeball where the Rocker Arms go and then drill a small hold in the driver's side Cover (on the upper surface) that will hold a grommet for a PCV Valve. https://www.jegs.com/i/JEGS/555/5222...6%20Components EDIT: I do like the baffled gromets that Taco mentioned.

On the Passenger side Vlve Cover I'd eyeball the Rocker Arms, drill a 1 1/4 inch hole and install a grommet for the Proform 141-630 Push-In Oil Filler Cap. https://shop.advanceautoparts.com/p/...cHqw&gclsrc=ds
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post #4 of 17 (permalink) Old May 4th, 19, 10:23 PM
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Re: Best way to install breathers in these Valve Covers

$768 for VALVE COVERS?
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post #5 of 17 (permalink) Old May 4th, 19, 10:33 PM Thread Starter
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Re: Best way to install breathers in these Valve Covers

Quote:
Originally Posted by Rich-L79 View Post
$768 for VALVE COVERS?

LOL...I know it is insane but I have always loved the look of them. Need to start saving my pennies Not sure if I go natural finish or black.


Tacomatrd,,


If you ever decide you want to change things up, give me first crack at yours


Pat
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post #6 of 17 (permalink) Old May 4th, 19, 10:46 PM
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Quote:
Originally Posted by Pats70ss View Post
Quote:
Originally Posted by Rich-L79 View Post
$768 for VALVE COVERS?

LOL...I know it is insane but I have always loved the look of them. Need to start saving my pennies <img src="https://www.chevelles.com/forums/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" /> Not sure if I go natural finish or black.


Tacomatrd,,


If you ever decide you want to change things up, give me first crack at yours <img src="https://www.chevelles.com/forums/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />


Pat
OUCH I didn't notice that price!! I bought mine 4 years ago used for like 150 bucks on here! Keep an eye out for some that are for sale.

That's wild but I doubt I'll ever change them. If I do I'd let you know. They are definitely my favorite valve covers on the market!
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post #7 of 17 (permalink) Old May 4th, 19, 11:06 PM
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Dang these went up in price!
This is for a single one
https://sdparts.com/i-24120729-chevr...RoCBagQAvD_BwE
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post #8 of 17 (permalink) Old May 5th, 19, 1:12 AM
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When the covers are new, figure out the placement between rockers. Use 16 gauge aluminum. Cut 2 pieces 2x4 inches. Use 3/8” long rods one on each end of the plate. Weld on the underside of the valve cover under the breather hole. That is all you need for a baffle.

I have these covers, and tried a few different things for baffles. The baffled grommets are too restrictive for airflow, and don’t stop oil ingestion through the pcv. I tried the moroso ones.

Because the covers came on the engine in my car when I bought it, they could not be welded on after having been oil soaked.

I ended up using the GM performance baffle tube and breather on one side. Part numbers 88962074, 25534355. Then on the other where the pcv valve is an in-line oil separator I used to have on my truck from JLT performance, mounted to the firewall.

But the plates would have been the best if done when the covers were new. Mark Jones suggested that method and size plates to me.
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post #9 of 17 (permalink) Old May 5th, 19, 2:36 AM
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Quote:
Originally Posted by pockets View Post
When the covers are new, figure out the placement between rockers. Use 16 gauge aluminum. Cut 2 pieces 2x4 inches. Use 3/8” long rods one on each end of the plate. Weld on the underside of the valve cover under the breather hole. That is all you need for a baffle.

I have these covers, and tried a few different things for baffles. The baffled grommets are too restrictive for airflow, and don’t stop oil ingestion through the pcv. I tried the moroso ones.

Because the covers came on the engine in my car when I bought it, they could not be welded on after having been oil soaked.

I ended up using the GM performance baffle tube and breather on one side. Part numbers 88962074, 25534355. Then on the other where the pcv valve is an in-line oil separator I used to have on my truck from JLT performance, mounted to the firewall.

But the plates would have been the best if done when the covers were new. Mark Jones suggested that method and size plates to me.
There are flat areas on the bottom of the valve covers to show where to drill/cut.
As for the moroso. I haven't had an issue unless it's at sustained rpm. They are definitely not restrictive if they are can't control oil through.
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post #10 of 17 (permalink) Old May 5th, 19, 11:36 AM Thread Starter
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I had purchased a used set if these that were powder coated, but could not get them to not puke oil out the breather holes and was not sure how to install baffles so I just sold them. The piece of aluminum makes sense but 2x4 seems pretty big?? Would you happen to have a pic?

I thought about doing the inline PCV that mounts to the firewall but still need a breather on the other side.
Friend of mine who has an engine with mega power has AN fittings coming out the front of both covers going to something mounted on each side if his core support to eliminate and blow by from the breathers.
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post #11 of 17 (permalink) Old May 5th, 19, 12:56 PM
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Re: Best way to install breathers in these Valve Covers

Just some information. That valve cover was made by an English Co. I have a pair in my garage ( just castings, not Finished). Of all places,,, They were made in Latrobe, Pa.
This place also casts a lot of Alum. NASCAR heads and Alum Blocks.
I was in the place one time when they were loading SEVEN pallets of Alum. B.B. engines.( G.M. & Ford & Mopar) They do a lot of speciality & EXP. parts (ALUM) for Ford, MOPAR, G.M.)
You think airport security is tough, This place is tighter than Fort Knox.
Bob

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1970 ( FRAUD) SS 468 Station Wagon - Driver.
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post #12 of 17 (permalink) Old May 5th, 19, 3:17 PM Thread Starter
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https://www.tennesseespeedsport.com/...-Cover/241-281

These are nice, similar design and a fraction of the cost
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post #13 of 17 (permalink) Old May 5th, 19, 4:25 PM
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Re: Best way to install breathers in these Valve Covers

$768 Yikes!, I thought they were overpriced when those sold for $298. I picked up a set at the swaps new for $100 so they are out there. One thing to note with the slant covers on a BB, they will not clear a stud girdle. I know, I tried it.
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post #14 of 17 (permalink) Old May 5th, 19, 4:35 PM Thread Starter
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I have roller rockers but no stud girdles
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post #15 of 17 (permalink) Old May 5th, 19, 7:30 PM
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Quote:
Originally Posted by Pats70ss View Post
https://www.tennesseespeedsport.com/...-Cover/241-281

These are nice, similar design and a fraction of the cost
Heck I'm tempted to sell mine for those. I like those!
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