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The blowby must be vented somehow. If you plug it or run it into a
closed container, pressure will build up in the crankcase and it will
escape at the weakest point. Probably at the rocker cover seal. To
catch the oil you can run the rocker cover vent into a vented can. If
you don't want the fumes to give you a headache you can pipe the catch
can vent into the air cleaner or if you have later Strombergs you can
run it into the ports on the tops of the carbs.
The best system is to run the oily blowby from the rocker cover vent
into the bottom of an oil separator. Clean air coming off the top of
the separator goes through a PCV into the intake manifold. Oil
collected in the separator is continuously drained back into the
crankcase via a hose into the oil pan or into the fuel pump blanking
plate if you are not using a mechanical pump. No maintenance and no
remembering to empty a catch can. The whole system including the
crankcase is under vacuum to help keep seals from leaking. And the best
part is that there are no fumes escaping to give you a headache.
Richard Good
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