| the actual pcv valves are mounted under the plenum and cannot be installed backwards since only one end is threaded... there are restrictors in the other tubes... there are a total of 4 tubes... 2 from the front of each valve cover to the accordians... and 2 from the rear corner of the driver side exhaust valve cover which lead to the plenum PCV... Now which ones are you talking about exactly? When I pulled my accordians they had a tar like gunk from the point where the crank case hose came in. (front ones)
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