Originally posted by John H. Meredith:
Larry;
PCV is not required/needed "down under".
It's just extra "plumbing" that does nothing, for anything and a waste of time/money for an early vehicle, especially a Hot Rod.
It didn't come out till the 60s here (from factory) and only required on 1975 & newer vehicles in California.
A 'factory' system, in good working order is okay as mentioned.
Happy trails. We seem to go round and round about this topic... I did my masters thesis on gas sensors for automotive pollution control so I feel that I have some knowledge about the topic. If I had it handy, I'd give you the references to look it up yourself. The literature indicated that crankcase gases were the biggest pollution offender and a functioning PCV system is the most rudimentary pollution control device. It also indicated that the optimum fuel/ air ratio to minimize pollution (NOx, CO, and hydrocarbons) is stoichiometry. It is not part of some widespread conspiracy to consume more fuel.