620 engine
Having just returned from Cadwell after after a " blown " engine, I've just dropped the oil to find parts of piston ring and gudgeon pin circlip, not to mention the squashed spark plug.
I haven't got time to investigate any further at the moment but thought if anyone had a spare engine, or any other substantial parts, crank, cylinders, heads etc. that may be available, I would appreciate it if you could let me know.