I started cleaning the block and I think it feels fairly good now. How clean does it need to be?
There is still some discolouration but I don't think it should be polished flat? Making a coffee now and will clean the headers next. Should be an easier process.
All going well I might have a crack at drilling them out before the weekend if I have time. The one on the left side is a bit long so I might shorten it to reduce the amount of drilling.
