I would agree with the 155 cc j (stock) heads.
My present porting has my modded head up to 172 cc but still not happy with the flow.......Just yet:toothy10:.
And the rate I'm going, it will be another year before there done.
Hows yours?
About ready to button it back together Yet?
Will be interesting to see the difference. To bad you didn't have a ET before you pulled the eng down..........................