There's a guy still selling them for the original inventor, google En Valve, and it will lead you to their site. They are about $60 with shipping now. It sounds like it should work, and I read many testimonials about it, but I'm concerned that it will cause performance issues, by adding too much air to the intake mixture, and causing a lean condition that I can't tune out. Bronze, let me know if you had to re-tune for the En Valve, or if it ran without any changes.
I may be barking up the wrong tree with this Crankase Pressure issue. I just know I'm blowing oil out rear of the valley pan, and want it to stop. I'm running 2 breathers (the twist on has a poor seal in the stock valve cover, and I'm going to be making a rubber gasket to help alleviate that), I'm also running a PCV vlave. Thought if I got my setup to be more like stock I wouldn't blow rear valley pan seals. (Vent passenger side back into air cleaner housing.
Anyone running 2 PCVs? Issues with this? Problems?