I agree Nodge - looks like part of the diagnosis. The intent pattern on the cylinder head really doesn't look too bad. Typically indents tend to be a little deeper on the exhaust side of the head - largely because this is the side that gets hottest (no cooling air fuel mixture on this side of the head!)
What is interesting - and perhaps I am seeing things that aren't there - is that the ring indent pattern seems more described on cylinders 2/3, extending to the inlet side. Perhaps this supports a localised over heating? Air lock in the cylinder head perhaps???
What is interesting - and perhaps I am seeing things that aren't there - is that the ring indent pattern seems more described on cylinders 2/3, extending to the inlet side. Perhaps this supports a localised over heating? Air lock in the cylinder head perhaps???