With the head off its time to examine the cylinders, block and pistons. Lets start from the back and work forward. Cylinder four has a carbon buildup but looks okay.
Cylinders 2,3 are similar to 4.
And now for something rather different! Cylinder 1 has carbon but has a light grey appearance. This may indicate a gasket failure resutling in coolant "steam cleaning" the top of the piston.
The location indicated by the green arrow was full of "grit" that reminded me of a hard water scale or buildup. More evidence of a failed gasket.
Here are the valves. These look okay but only a pressure test will tell definitively.
Now its off to the machine shop for pressure testing, magnafluxing and a valve job, assuming all goes well and no cracks are found in the head. Could it be that easy?More info
This site has some excellent information about MGB head identification, etc:
http://flowspeed.com/cylinder-ident.htm
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