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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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I think by 69 Ford had gone over to the closed system..the oil cap should have a connection where a hose gets attached and then attached to the air cleaner..all the oil fumes are reburned. If you are using a regular vented cap..make sure it is clean..this may require replacing it every month..
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