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Look and see if both heads have a vent where the air cleaner bolts up.

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I run a 3/8 braided hose from the vent by oil pump to a tee behind the motor one leg of the tee to trans vent. The connect the other end to a small stainless breather element. When you beat on the motor you will get some very minor seepage out of it, its fine they all do it. Yes definitely run vents. If the top has breathers also just leave it be and vent the bottom as well.
 
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