If you buy a used set of the old style cast
Valve Covers, make sure you know which of the breather/oil fill holes have
been opened. Especially if there is text or a design that wont let you
reverse the cover on the same side of the car. Many of the older aftermarket
ones were made with "knock out plugs" that covered the holes you needed for
oil fill, PCV or breather. Some had one and some had two, one on each end.
It also took a little work to smooth the holes. If someone got carried away
with the file, the twist in cap may not fit tight.
If you get sheet metal
ones, make sure you get the hold down tabs that spread the force of the bolt
out over the cover. Some were triangular, some more like a 3-4" strip of
metal with a hole in them.
Many moons ago as a
mechanic, in almost every case with the sheet metal ones we had to use a
small hammer and smooth out the depression created from the bolt when they
were put on before. If you didn't do this, the cover wouldn't tighten
correctly when the new gasket was installed. The depression was
usually created from an owner over-tightening the covers to stop a leak.
Usually this "fix" just cracked the old hard gasket and made the oil leak
VHubbard. Sept 2015
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