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Nice breather box Bogara. If you vent to air you will have positive pressure in your case, and a mess around the filters venting to air, and rear main seal leaking sooner. Connecting to carbs will give negative (better). Good breather boxes have some internal baffling to help trap the oil mist so it can return to bottom of box and return to case. If you don't plan to turn your engine past 5K all the time, you will not have too much case pressure to worry about.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans 
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG
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