So this got a little bit more expensive
After thinking and doing my research I believe the valve broke due to detonation and it burnt the valve.... no doubt the rest of the exhaust valves experienced very high temperatures as well so rather than reuse them I have just pi**ed away a small fortune again on @*!# I probably don't need and no one will see
Bought the full ferrea valve setup off TORQEN as their prices are some of the cheapest around and the service is always great.
Intake + exhaust valves, dual springs, spring seats, titanium retainers, keepers, valve stem seals and bronze valve guides.
So no point in all the hassle of keeping the old stuff in order
Always handy to have spare for the next N/A high rev build.... well I now have a spare set of BC valve springs+shims