Richard:
probably due to excess crankcase pressure from the blocked PCV.
Also, exhaust smoke is not necessarily oil - what colour? It's fairly easy
to set up SU's so badly that you get horrendous amount of dark smoke from a
too rich mixture.
The whole engine has to work as a system - change one bit, you change the
lot. Blocked/non working PCV will probably effect your mixture...and
manifold vaccuum (hence dist vaccuum advance).
PCV valves are a fairly simple bit of kit - they're basically just a spring
loaded rubber diaphraghm. About the only thing that ever goes wrong is a)
clogged with gunk (clean out) or b) holed diaphragm (replace)
a) will give you too much crank pressure, b) will give you a lean mixture
and uneven running.
Just out of curiosity - are you in Sydney? and which local MG specialist?
Tim
66MGB YGHN3-3238
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