I was wondering because my buggy came "new" with the 58.5mm head on it and all of those heads I have looked up on the net say "big valves big port". I had my intake off the other day and as far as I could tell the intake port was the same exact size as the spacer and as far as I could get my finger in there I didn't feel any imperfections. I guess I will know for sure one day when I actually remove the head and check it out.
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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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