01-03-2013, 07:06 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
You need breathers on the motors especially if they are stroked with more windage or if you are running high or a wide range of RPM. Originally they had a breather/fill cap in the front of the manifolds. When that went away it was done with valve cover caps.
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