Do you adjust your gaskets?

[Cp1]

i agree gaskets do interfere with flow sometimes and have to be modified but keep this in mind the part you are showing there while the gasket may seem like it is really blocking the passage of flow it isnt at all because where those chambers go to isnt really important nor does flow really have any effect the air valve on relies on the air pump for pressure and it is very little, at for a very short time so improving the gasket there isnt really going to gain you a noticeable difference in anything. now if that same port were say an intake runner and the gasket blocked that much then you are going to see a totally different picture by modifying it. dont sweat the small stuff.