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Old 11-16-2019, 04:06 AM
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Default Separate valve cover question.

I am looking at the Edelbrock finned valve covers because everything else on the market is ****. The problem is is that they have no holes. Other than the pain in the ass of an oil change what would be the ramifications of running the engine with nothing but PCV no breathers in the covers

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Old 11-16-2019, 05:05 AM
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PCV is Positive Crankcase Ventilation.
To get the crankcase gases out of the crankcase via the PCV valve you need to get air into the crankcase.
For Pontiac V8 usually thru a vented oil filler cap or a tube to the aircleaner, located in one of the valve covers.
Why Edelbrock makes Pontiac valve covers w/o holes for this is a mystery.
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Old 11-16-2019, 07:42 AM
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I guess if you would have read the Edelbrock listing deeper for those type of valve covers further instead of just jumping online and posting up a question you would have seen that in the Edelbrock 4200 series of parts they offer the needed breathers and oil fill caps , grommets and gaskets that the purchaser of those valve covers need to install to fit there needs!

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Old 11-16-2019, 07:44 AM
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Engines early on, Chevrolet for instance, had oil fill at the intake, usually with a vented cap and sometimes with the vented line from the fill tube running to the back of the intake with an inline PCV, and/or a downdraft tube. These engines used covers with no oil fill or vent holes at all.

A lot of the aftermarket aluminum covers follow this logic, M/T covers are another cover that is cast without holes, but they do have knock outs on some versions.

Since Edelbrock and M/T go back beyond the era of engines needing vents in the valve covers I would assume they just kept with that logic on some covers even today and cast them as they did then, and since they are a custom piece it leaves the end user the option of doing anything they may want to the covers, like the side vents that bolt on for one example, which was commonly seen in the 60's.


Last edited by Formulajones; 11-16-2019 at 07:50 AM.
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Old 11-16-2019, 08:58 AM
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Quote:
Originally Posted by steve25 View Post
I guess if you would have read the Edelbrock listing deeper for those type of valve covers further instead of just jumping online and posting up a question you would have seen that in the Edelbrock 4200 series of parts they offer the needed breathers and oil fill caps , grommets and gaskets that the purchaser of those valve covers need to install to fit there needs!
If you weren’t such an asshole you would have read between the lines and read that you can get a breather from anyone but you still have to machine holes in the valve covers and my question was what if you don’t do that

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Old 11-16-2019, 09:02 AM
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64speed,
I'm going to my buddies house today that may have the valve covers we spoke about. I'll send you some pictures if he still has them and I'll call you later.

-Joe

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Old 11-16-2019, 09:17 AM
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Ok thanks

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Old 11-16-2019, 09:18 AM
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64 - Many others have successfully installed the finned VCs on e-heads, even if minor modifications were needed. Did you determine how far off the holes are? I know you want a direct fit without mods but if the gaskets match up to the heads you will still get a good seal. Just elongate the holes a bit.

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Old 11-16-2019, 09:30 AM
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Just to keep the record straight;

Pontiac back in 1955 (Their first year for an OHV engine, the Stratostreak) used a breather cap on the valve covers and continued to use the valve covers to add oil to the engine up till 1981. In 1955 they had a road draft tube to equalize the crankcase to atmospheric pressure, and exhaust blowby gases. In 1963 they started to use a PCV system with a vented breather cap, and in 1968 they switched a unvented filler cap.

Pontiac has used the valve covers as an oil fill point since 1955 through 1981.

1955 Pontiac Stratostreak engine:


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Old 11-16-2019, 09:36 AM
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Quote:
Originally Posted by 64speed View Post
... but you still have to machine holes in the valve covers and my question was what if you don’t do that
Not much point using synthetic oil if you're just going to contaminate everything.

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Old 11-16-2019, 10:11 AM
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Ok I will have an 1 1/4 hole drilled in the covers. I just wondered if there was a reason they did that

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Old 11-16-2019, 10:38 AM
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Mostly because Edelbrock uses the chevy yardstick to measure everything, even though that is a flawed policy. This isn't the only time that they have tried to use chevy engineering ideas to apply to every brand out there. Should call the company Chedelbrock.

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Old 11-16-2019, 11:46 AM
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You could vent each valve cover from the side with hose going to the airfilter. Using fittings made something like this:
https://www.summitracing.com/parts/trd-2162/overview/

Would have to use a funnel to add oil.

Wouldn't have to mess up the looks of custom finned covers.

Clay

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Old 11-16-2019, 11:50 AM
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My 409 Edelbrock valve covers I got a hole saw to cut one to add a breather. Just try and locate it between rockers so you do not get oil squirting right at it. And my 409 has the intake breather in front.

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Old 11-16-2019, 08:13 PM
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Quote:
Originally Posted by Sirrotica View Post
Mostly because Edelbrock uses the chevy yardstick to measure everything, even though that is a flawed policy. This isn't the only time that they have tried to use chevy engineering ideas to apply to every brand out there. Should call the company Chedelbrock.
It’s not edelbrock covers I am having trouble with

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Old 11-16-2019, 09:54 PM
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Quote:
Originally Posted by 64speed View Post
It’s not edelbrock covers I am having trouble with
You would be if you bought them with no oil fill holes in them as you eluded to in your first post, but I digress...………….

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Old 11-17-2019, 08:22 AM
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You spend so much time on line I was hoping you would develop some self reliance and search out a answer on your own for once!

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Old 11-17-2019, 09:56 AM
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Quote:
Originally Posted by steve25 View Post
You spend so much time on line I was hoping you would develop some self reliance and search out a answer on your own for once!
I am fully capable of finding out answers on my own. I just wondered if there was a SPECIFIC reason why they didn’t have holes

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Old 11-17-2019, 09:56 AM
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These are what I was eluding to in the earlier post.

If you are going for the classic 60's era finned appearance, these side breathers are what would have been used in that time frame and would look more "day 2" correct, and why those covers are cast the way they are with no holes for breathers on top, so they can be converted this way. Not to mention they are much easier to install than trying to machine the fins off the top and ruining the look. As I also mentioned, since other brand engines didn't use breathers in valve covers for a while, it's not surprising to see covers like this on other brands that did, since the Pontiac engine was dead after 1981 and doesn't get as much love from the aftermarket. Most people working in these facilities now weren't even born before 81.

https://www.summitracing.com/parts/edl-4201/overview

You can also buy these without the logo, more money of course, but it would be more correct for the era.

https://www.summitracing.com/parts/ott-6810/overview

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Old 11-17-2019, 09:57 AM
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Quote:
Originally Posted by Sirrotica View Post
Mostly because Edelbrock uses the chevy yardstick to measure everything, even though that is a flawed policy. This isn't the only time that they have tried to use chevy engineering ideas to apply to every brand out there. Should call the company Chedelbrock.
Sorry I misread your post

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