The general view over here in what one person described as 'the old country'
is that the more breathing the better - especially so on a performance engine.
There is no reason I can think of why you should not use a rocker cover
breather if you want one. Perhaps the reason the breather was blocked off on
the metal cover you have is that it was not usual for a breather on the
Spridget but was on the Mini etc.
I vent my rocker cover breather to an oil catch tank but find that most oil is
'breathed' via the timing gear case, also to a catch tank.
This is not typical and I have no PCV valve, and the car is emissions tests
exempt (here in the UK).
Daniel 1312
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