Yea, you can remove the head gasket. Can't on a modded motor tho.
As for the porting, the thread name says it all. The exhaust porting is just a piece of the pie that makes a good port job. I do alot of transfer work. More time there than in the exhaust.
I ruined many a cylinder trying
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2000 GNC 5N\
2001 GNC 9N \ 40+ class
2004 GNC 9N /
2014 rock crusher "GO tortoise GO!"
2016 Byrd Rooster
Father of the "11" time National champion,and worlds fastest woman ATV racer
A few fast LT80's
250R~300cc's
300ex
350 Rancher
Kymco Mongoose
Survivor of the 12 Hours of ATV America 04 and 05