Before I start repacing parts at a whim or paying someone $60 an hour to
work on this I would love to hear any advice on what to check or how to go
about solving this problem:

After warm up my 86 Westy intermittently blows lots of whitish/bluish
smoke out the tailpipe and simultaneously experiences significat power
loss.  Head gaskets were replaced 1 yr ago and it does not appear to be
loosing coolant or mixing coolnat into the oil.  The amount of smoke is
amazing.  It is kind of amusing when people are tailgaiting and they get
smoked real bad then they back way off.  The power loss is not sharp like
you would experience with loss of spark but rather a general loss of power
(about a 50% reduction) but it still stays running.

Thanks very much for any ideas!

Andrew Fox
86 Westy
Ft. Collins, CO