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Originally Posted by $90esky
I just got a set of twin carbies on a manifold and from the stock oil cap on the rocker cover is a hose that runs to the stock carby. Do I block it at the cap or just replace the oil cap to a closed one?
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Most aftermarket sports air cleaners have provision for the breather to be fitted.
You should do this - do not block it off or use a non-breather type cap as it will not be good and could cause too high a crankcase pressure.