Can someone give me some feedback on the following?

- What can be done to make a stock head better as far as machining goes? I'm familiar with milling a banshee head a little to raise compression etc...  I don't want it to run to hot and stay with premium pump gas.

-  Are there any other piston options besides Wiseco.  I'm okay running a Wiseco though.

- Can someone direct me to some LT250 specific powervalve info.  Is it supposed to spring closed?  I bought new springs for it prior to even opening it up because the OEM's were cheap.  This is my first powervalve work.

Thanks Guys!!  Having a good time with it so far!!