The way I see it, there are four ways to evacuate crankcase gases.
1) intake manifold vacuum through a PCV valve.
2) exhaust collector venturi through PCV valve.
3) vacuum pump to exhaust or atmosphere.
4) vented to atmosphere.
I presently use the least favorable method of venting to atmosphere. My Cannon triple intake manifold does not have any PCV plumbing.
I have questions. Has anyone modified a stock 240Z smog pump the act as a vacuum source, (pump), for the crankcase? If so, have you measured the vacuum under operation? How does it's vacuum compare to the intake/exhaust options mentioned above?