The problems never end

[Ian McGowan]

I would say that there is little doubt that those "tram line" gouges are a result of a loose gudgeon pin resulting from a broken/ loose pinch bolt. When I suffered that, a few years ago now, the broken-in-thread pinch bolt, in exiting the conrod, smashed two pieces of piston from the skirt - not a happy state of affairs. The piston was destroyed, the conrod was damaged beyond repair, all because the previous rebuilder had not used the correct, new, HT pinch bolts!!
( on the up side, I later successfully reused the gouged block in a different engine bored out to +80 thou to accommodate Renault 4 pistons)