Callums project(s)

[Niall]

Them pullies are prone to cracking like yours. Any that failed in the early days of the cars life were replaced under warranty by pug with the single bolt type when they did the repair work.
I would be checking all them valves. There is not a lot of room for error at all with the valves in these heads so id be surprised if there is no damage. My spare engine snapped on idle and it bent 4 valves.