Originally Posted by 80stech

I'm pretty sure the marks on the dipstick are wrong (on mine anyway) and the oil level is far to high on the full mark, causing the crank to dip into the oil. It may have been done intentionally to create the vacuum break for the CCV system but results in too much splash on the cylinder walls and a lot more oil going up against the rear main seal. As far as the "Mod" goes. If you understand how the systems work you will realize how much luck is involved by having it work by just following the instructions in this thread about the "dynalast valve" .

The dynalast valve does not control anything about the "amount" of vacuum in this case. Using only the one port instead of both probably has more of an effect and points out even more about what is unknown by people following this blindly.