10vt Head Modifications

[Jorgen Karlsson]

Hi,

I would go for 38mm as long as there is still some room between the valve
and the cylinder wall. 38mm is a small valve for the power levels these
engines are good for.

If the valve is very shrouded this will affect maximum useful valve lift,
for example an unshrouded 38mm valve has a maximum useful lift of ~10mm. But
I think that 12+mm is useful with 38mm exhaust valves in our engines.

Jorgen