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I am sure that the point of the chamfer is to ensure a clean hole. Going back and adding one after the fact is not going to add anything extra to throttle response that is not already there with a 7/64 opened hole. If you did not add a chamfer going back afterwards and adding one is not going to improve anything.



Actually I got to thinking about this... Chamfering the hole not just cleans it up, but it breaks that sharp edge, and can then reduce the turbulance of the air going thru there, just allowing it to funnel thru in a nice wooosh, instead of curling around it.

Benny Black & Silver '02 Too many mods to list Not enough miles ridden