How's my port!

I’m of a porter so with a grain of salt from what I remember reading, the bump in the roof of the exhaust port can take a minor grinding, at most because there is water behind it. Proceed with caution! I also have read there is a most minimal gain there.

The bowl porting your showing, should have a percentage of bowl ground away relative to the valve size. I forget what the percentage is. I do believe there is information in Justin’s thread on that and for surly else where but I’m not sure where to send you on that.