Re: MGB overheating

[Mike Duvall <duvallcom@sbcglobal.net>]

I discovered that the EGR valve was plugged on my B.  I pulled the plug 
out and I see a lot of smoke in the exhaust.  The plugs are a little 
black but not gunky.  I get quite a bit of air pushing out of the oil 
filler on the rocker.  I did a compression test and found #1  160, #2 
155, #3 155, #4 175.   The engine runs well.

Head gasket, worn rings?  Anyway to tell the difference other than 
pulling the head and checking the gasket or doing a leakdown test?

Mike