Crankcase evacuation kit!?

Yes, they work. they were good for about 10 hp (verified on dyno) on a friend's bowtie big block. To work correctly, you need to remove your dipstick and cap off the tube. Otherwise, the vacuum that you are trying to take advantage of, will be lost by air leaking in through the tube.

If you are blowing out your dipstick, check the the blow-back valve down on the header collector, it might be stuck and not opening. L8r