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oil leak

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I have a '66 with a '69 351W. i seem to have an oil leak coming from under the oil filler cap because there is always oil all over the spark plug wires. Why am i having this problem and what do i do to fix it?

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You didnt say what kind of cap you have (whether or not its ventilated) engine get worn out, they vent gasses with oil vapor in them...if u have a ventilated cap, this vapor collects on the valve cover.

It's reduced when an engine has a correctly operating pcv system.
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