How crucial is it to change intake and exhaust valves

[Neru]

Half way through my F23 build which I aiming for 200kw atw and was curious to whether the intake valves and exhaust valves need to be changed

any help will be greatly appreciated

cheers

Neru

 

[Prawn]

270bhp at the wheels, you'd be fine with a standard valve train at that level.