Posted by Northern Calif Dave on Tuesday, November 16, 2004 at 2:24PM :
In Reply to: Do truck flatheads use a filter on crankcase vent? posted by DG on Tuesday, November 16, 2004 at 2:02PM :
The oil filler pipe is connected to the air filter. Air is drawn in through the air filter, down the oil filler pipe, through the crankcase, out the back pipe, through the PCV valve and exhausted into the manifold.
So yes, air is filtered before it enters the crankcase
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