Originally Posted by tooljunkie
glass block is used for finishing something you want really flat.
a little water under the wet/dry paper and it sticks like glue.
i use a piece of polished granite.
didnt do anything to my bike today,but do want to take it for a snow ride.
Gotcha. I wasn't going to mill the head surface, just smooth out the combustion chamber a bit.
All the factory texture CAN'T be good for flow.