After a couple of hours I decided to assess the damage and the reason for the failure seems to be a newly fitted cam bucket disintegrating and taking out the valve and the camshaft, I will post a picture later but I am now left to ponder the next step as I have spent a lot of time rebuilding this engine and only replaced the cam bucket because the old one was worn and noisy.
I have a nice V8 in my garage which would fit nicely in the space vacated by the blown engine or I could fit the tuned 2L from the Grinall.
What will the piston look like when I take the head off, any bets?

Dave
