Leaky valve cover follow up.

Like TrailBeast said, (I wish I knew his first name), I've had some big block heads with well over an 1/8" of VC rail casting deviation, that leaked no matter what gasket or VC. I've found some heads are ok, and some are really bad as cast. Once I even got shut down and lost a race while staging because of a VC rail leak and the evidence of oil smoke that the starter didn't like.

I now mill the VC sealing surface on any head I use for racing, and I can use the regular FelPro VC gaskets that come in the gasket set, or any other, without leaks.

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