What mods have you done to the motor? What is your target build? Matching the parts that go in is key to performance I see a lot of motors built with the thought in mind that the bigger the better
The number one thing #1
VELOCITY
Don't over port the head just clean up cast slag on the Port floor and SSR most of the work will need to focus in the bowl and around the guide you can however mill more than .010" off the head I have mine milled .065"
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