[rich]

I was drewling over the work work Russ is having done in the Euro Heads vs US heads post. I almost hi-jacked it with the following but decided to start a new discussion. Here goes...

I was talking to my machinist friend about valves when he repaired my damaged "S" head. He was surprised by how fat the stems for the 928 heads are. He thought he could easily source much more modern light weight valves with smaller diameter stems.

Questions:

Does anyone know if the "S" throttle body, plenium, and spyder can handle increased flow from larger valves and higher lifts and longer duration cam profiles?

Are the current "S" heads choked by the "S" intake now? I mean, if you were to use like 8 throttle bodies in place of the spyder and have this as your only change would it allow more air/fuel flow?

Or will the stock "S" spyder handle and deliver more air/fuel to the pump than the current heads allow?

The reason I'm asking is: In theory, why work the head numbers if the intake is the limiting factor.

I know in Russ' case it sounds like they de-designed the intakes, but what if you want a stock look?

Anyone ever write about this?

I thought about experimenting with a set of US heads.