I have a 347 and am experiencing excessive oil pushing into my catch can. I also have my breather lines from the valve covers in the rear. I was thinking of flipping them around to the front to see if it will help but still feel the crankcase preasure is just to high. The motor has about 400 miles total on it and also has oil restricters with edelbrock alum. heads that should have large enough gallies IMO. Would the PCV system have much of a impact on this? BTW, it only does this in the class one races when its turning 8k. Any racers have some ideas?