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Crank case evacuation systems....do they work ...built 572 world block indy head..will these 35.00 systems work or will i need a 3 vane vacuum system any thoughts would be appreciated thanks pat( pump gas streetable ocassional track)

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A evac system can pull a MAX of 5"hg and if your exhaust
has more than 5" of back pressure all you will do
is burn out the valves on the evac and pressurize
the crank case... for every inch of back pressure
your exhaust has you will reduce the amount of vac
that can be pulled on the engine... there is a way
to do it with a evac but you need to mount it after
the muffler