RE: 10v NA head: 38 to 40mm intake valves possible?

["Buchholz, Steven" <Steven.Buchholz@kla-tencor.com>]

If this is a turbo engine, I've heard that it might actually be better to
make the exhaust valves bigger ... or split the difference between intake
and exhaust.  An NA engine is using the piston as a pump that has to draw
through the intake tract, while a turbo tends to provide a bit of assistance
in this regard.  No, I haven't BTDT as yet so I don't spek from experience
... just offering up something you might want to look into further ...

Steve Buchholz
San Jose, CA (USA)

> -----Original Message-----
> 
> Is it possible to machine in valve seats to the 10 valve 
> solid lifter head 
> to accept 40mm intake valves (instead of 38)?
> 
> Is there a reason why I shouldn't do this when I have my head 
> re-worked? (by 
> that I mean P&P, new valves, high lift springs, shrick cam, seals & 
> guides... everything basically)