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Also make sure you put the breathers in the valve covers towards the front of the engine.

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Why? Just because the instructions say so, or is there another reason? Mine have been on the rear of my valve covers for several years with no issues?
Maybe this is for "wheel standers" only, which mine isn't.

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hey guys, not to thread hi-jack, but when running this setup, is it still beneficial if only one side is the evac setup, and the other valve cover is a PCV valve? Or do both valve covers need the evac setup for it to work properly?

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Don't know the "why's" and "if's" but I run both, I run a PCV with a ".060" carb jet in the line along with the crank evac system but my car is a street/strip car. A full out race car may not see a need for the pcv.

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Also make sure you put the breathers in the valve covers towards the front of the engine.

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Why? Just because the instructions say so, or is there another reason? Mine have been on the rear of my valve covers for several years with no issues?
Maybe this is for "wheel standers" only, which mine isn't.

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Well, the engine tilts back and the oil, however much would run to the back of the head. Just my opinion, sorry it offended you.

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You did not offend me, sorry if you took it that way. I was just wondering what the reason was. Like I said, mine is located to the rear and has been for an awful long time with no issues. Thanks for the input.

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I ran into an issue with mine in the back this year. The valve cover I had on had the passenger side in the front and the driver side in the rear on my 1970 duster (408). It would smoke from about 1000ft to the turnoff after a pass. I assumed it was a tire rubbing since they were close and I had just put a new ladderbar set-up on it. While under the car about the third time I noticed oil in the driver side collector. I loaded up and while checking it out at home removed the hose leading down to the evac system and it was wet from sucking oil. I bought a new set of aluminum covers off ebay and redrilled the cover so that it was in the front too and it fixed my problem. Probably a lot of oil laying in top the edelbrock heads at the end of a pass.

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Thanks. My car is done for the winter. So, over the next few months I'll get under her and check mine out. If I find oil in the valve and or the hose, I'll move the breathers to the front.

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I ran into an issue with mine in the back this year. The valve cover I had on had the passenger side in the front and the driver side in the rear on my 1970 duster (408). It would smoke from about 1000ft to the turnoff after a pass. I assumed it was a tire rubbing since they were close and I had just put a new ladderbar set-up on it. While under the car about the third time I noticed oil in the driver side collector. I loaded up and while checking it out at home removed the hose leading down to the evac system and it was wet from sucking oil. I bought a new set of aluminum covers off ebay and redrilled the cover so that it was in the front too and it fixed my problem. Probably a lot of oil laying in top the edelbrock heads at the end of a pass.

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Thanks. My car is done for the winter. So, over the next few months I'll get under her and check mine out. If I find oil in the valve and or the hose, I'll move the breathers to the front.

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Remember they do not recommend using this set-up with mufflers. The whole idea behind them is to remove built up pressure in the engine by creating vacuum. Muffles create back pressure. That being said I did have mufflers bolted on my collectors earlier in the year before I blew them out and to some extent I still had vacuum but I didn't have a complete exhaust system.

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I run Dynomax Ulta-Flo mufflers. At idle there is almost zero vacuum. At around 3000 rpm, the system is pulling around 5" of vacuum. It will pull that much on up the rpm scale. This is one of the reasons that I also run a pcv. It pulls at an idle and drops off at higher rpms. So I have some vacuum all the time.

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i used (4) 55 gallon dyno drums and 6" pipes for my testing and still lost vacuum at WOT

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I just eliminated the Moroso pan evac in faver of a 1 qt. breather tank foe each valve cover.

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I just eliminated the Moroso pan evac in faver of a 1 qt. breather tank foe each valve cover.

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Have you run it since making that change to see if the smoke stopped?

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in the dyno testing i have done the e-vac systems will pull vac at idle with mufflers, but once you get into WOT there is either no vacuum or pressure depending on your exhaust system

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I've done some testing with my systrem and came to the same conclusion. I run my evac tubes ( modified ) in my header extensions. The pic denotes my home made water monometer pulling a slight carnkcase vacuum at idle - with turbo muffs dumping in front of the axle. The vacuum will increase to about 5" H20 until about 3K. Then it starts to drop as the exhaust back pressure increases. Although they really aren't ment for a street application, they can be used on the street - up to a point with a very low back pressure exhaust system = noisey .