[LS6427]

Originally Posted by JFM-jr

For a high performance application this method seems pretty solid to me. Stock motor as LS6427 has stated multiple,many,dozens,hundreds of times is a different story..... I'm in this same boat making north of 575 crank HP with my LS2. I am tired of oil sitting in the intake of my new motor and my catch can being bone dry. I am capping the PCV of completely and installing a breather in each valvecover. Just about everyone I am friends with in the car circle that is running a high HP drag race V8 has no vaccume source on the crankcase. Until somebody comes with a better method it's getting vented to atmosphere.

Also, I was thinking: What if a small hole was drilled into the exhaust pipe, say about 1 foot past one collector. A 1/4" diameter metal line is bent and put in the hole and then turned so it points rearward inside the exhaust pipe. Then welded in place. So the exhaust gasses going by it will cause a vacuum on that metal line and draw air from it. Just like a drinking straw. That line can then be attached to a rubber line that attaches to the valley cover port or a valve cover port, which will draw crankscase gasses.
Would just have to do a test to see if it creates enough suction. If it does, a PCV valve could also be put in line if desired.

Or...a venturi. Its can me mounted low, maybe right in front of the air dam to catch air while moving. That can be attached to a line and also draw air from the crankcase that way.

BUT...a simple electric pusher air pump to push fresh air into the crankcase continually through the valley cover port and let it escape through the valve cover port vents...I think is the best.

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