What's the diagnosis on this condition: Compression at
about 100 PSI on 1,2,and 4, but #3 is at zero. I can
see the valve stems going up and down. There is no
unusual noise like a valve knocking on a piston. I was
not present when the failure happened, so maybe it was
noisy at one time.
Hole in the piston? broken/stuck valve?
71 MGB GT
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