Posted by Kaegi on Tuesday, November 16, 2004 at 8:54PM :
In Reply to: Re: Do truck flatheads use a filter on crankcase vent? posted by Northern Calif Dave on Tuesday, November 16, 2004 at 6:29PM :
The draft tube style works by air blowing from the fan and the motion of the vehicle in through the breather cap on the oil fill tube , which, in theory will push crank case fumes out through the draft tube on the side you mentioned. The filter on the draft tube is to keep dust out of the crank case.