I just experienced a problem related to not having a breather. It was ugly. The guys at Best of Show and I will be figuring something out for my car in the next couple of weeks.
Basically I showed up to El Toro for RTTC and was leaking a little bit of oil from the dipstick where it presses into the side of the block on an LS engine. I had beaten on the car the previous week to sort out the brakes, and in the process developed a little leak. We replaced the little rubber O-ring seal for the dipstick and called it a day. I'd never had issues before changing a few things, like heads and cam, and figured all would be fine. It wasn't. As others have mentioned, at high RPMs the motor puked oil out the side and all over my headers. I believe Steve Rupp had the same issue a while ago. As others have mentioned, you will have too much crank case pressure, and it all has to go somewhere. Perhaps the worst part of this issue is that without a breather and a catch can, the oil will just end up in your intake manifold. When I pulled over after the speed stop challenge we looked at my car and the LS gurus on hand said it felt like the car was pulling timing, among other things, all likely because the car was sucking oil.
Matt
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