Thanks for the clarification on this Tom. On mine the opening on the flange was " at least " a quarter inch smaller in diameter than the I.D. of the header pipe. I opened it to something more like an eighth to a sixteenth and went with the flange style gasket. It's nice to have the voice of experience and know how on here. It just seems odd to me to open the exhaust port and put a larger valve in, but keep the same restricted header flange. So are you saying opening it up is not necessarily bad just don't take it fully to the I.D. of the header pipe??
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MXR TrailBender 160R
SYC Perf head P&P,Matched intake and exhaust, A12 cam, Orange CDI & coil, Motorio pulley, 115mm Variator and lightweight drive face,11gm Sliders, UNI, modded muffler + 200 horsepower 
http://www.youtube.com/watch?v=3hx-hEWl10c
I'll take your insults as compliments and blame it on your lack of intelligence.
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