[Healeys] Re - 4 cylinder woes

[mike brooks]

To get a good compression reading one needs the valves to seal properly,  as well as no cracks, broken rings etc. The fact that no. 2 exhaust valve is "a bit black" suggests to me it might be leaking. Might as well grind the valves in, put the head back on and try the compression test again. 
Mike Brooks'56 BN2Scotland

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