Polishing cylinder walls

[BryMFL]

Since I've got my head off I found a bit of build up on the top of the cylinders and walls. I was wondering what the process is for polishing the walls and cylinder tops?

Someone else mention getting the valve slots machined smooth. Is this necessary?

Anything else I should do while the head is removed?

[greyturbo]

the walls should be cross hatched with a ball hone, the other stuff you might have to take to a machine shop.

[A4natomical]

what kind of build up?