There is a rubber tube that connects to the top of the valve cover. It appears that the normal installation has this tube connected to the housing above the two carburators. When I bought the car it was vented to atmosphere. Should I reconnect this vent to the carbs? What are the pros and cons?

Thank You

Most of these cars were done as you said and vented to the outside because they had a fair amount of blow-by gases that when blowing on top of two carbs caused build up in the long run. It will not hurt a thing with the exception of a little more emmisions on the ground.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

This hose was for the first kind of emission control. P.C.V. Possibly the rings & or valve guides are worn out.