Bill, it sounds like you have the wrong oil filler cap on the engine.
1967 Bs with the closed circuit breathing valve (PCV) use a vented
oil filler cap with a metal mesh filter built into it. Your cap
should be plastic, when it is installed you should see an open vent
slit right above the sealing gasket. Later cars used the non-vented
cap.
With the wrong cap, you are building up pressure inside the crankcase
and forcing too much oil into the PCV. The tipoff is that the idle
speed increases when you remove the cap. Moss or one of the other
big suppliers should have the proper cap (used from 1965-1968).
Hope this helps, PK
Paul D. Kile
kile_paul@aphub.aerojetpd.com
(916) 355-5162
GenCorp Aerojet
POB 13222
Dept 5784 Building 20019
Sacramento, California 95813-6000
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