Porting - take your time. You can always take more off. A little difficult to put it back.
Try to get the edges of the port a little more strait and soft
The runners you should finish off with some 220 grit rolls, and then the flapper. I haven't ported anything in YEARS some I'm sure someone whos done it more regularily could chime in.
Although next week I will be doing all my porting work sooooooooo.
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