BIL N KEL

What's the limit of standard zetec valves? I see the focus rs has sodium filled exhaust valves, does anyone know why this is? I'm currently building a zetec turbo and was aiming for 300-320bhp so would standard 2.0 black top valves be ok?

Thanks Billy

Karlos G

iTrader: (4)

They would be fine at that power yes, sodium filled dissipate heat better but the standard ones will be fine, you will need to change the springs though.