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[Rods2]

My thoughts are either a foreign object or an incorrect cam that has a lot of endfloat, so the cams areas have moved around. The fact you have aluminium broken off both sides of the bearing means it is unlikely to be a casting fault / fatigue that has caused the issue but something hitting it. The gouges on the head look reminiscent of when a Honda 250 I had, sh!t metal choke flap broke up and was ingested by the engine. The piston and to a much lessor extent the head was marked similar to that. If there is no foreign object in the cam box then I would check the oilways and sump as you don't want a blocked oil feed and finding it would confirm the source of the problem.

I think it is unlikely, but where the left and right cam sprockets are different to allow for the offset of the cylinder banks, has there been an issue there?

[Steve B]

pm sent 

[JamesV6CDX]

So do we concur something has broken off as opposed to just the way it was cast?

Thing is... The strainer is clear, as are the t vents. What else is there to check other than actual oil pressure?

I'm guessing bare minimum I need a new head and cams then, possibly 2?

[Andy H]

What do the journals on the cams look like?

The head is soft - the cams hard. If the cams are good then I wouldn't be concerned about minor surface marks on the journals,

I would be most concerned about excessive clearance allowing the cams to rattle around and/or lack of oil pressure.

[zoomer]

Tapping sounds a lot like Connecting rod bearing issue imho ?