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Old 03-05-2012, 10:53 AM   #10
Old Henry
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Join Date: Oct 2010
Location: Orem, Utah
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Default Re: Ventilating the Flat Head!

Quote:
Originally Posted by peteyshoes View Post
i have a small vent on the side of oil pan that seems to pull some air in.
The movement of air past that vent actually creates a vacuum that draws the air out of that vent, thus creating the draft from the oil filler cap through the engine as in my illustration.
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