There seems to be differing views on what valves to use for a turbo CVH.
One school of thought is that OEM valves are perfectly fine for a turbo CVH - even one with double valvesprings and higher RPM use.

Others say that a one piece stainless valve is far more reliable - even though they require bronze valve guides for the softer stainless valve stems.

The only engine I have used factory valves in is a Porsche 911 3.2.

What is the opinion amongst the CVH experienced?

Cheers