[chap52]

I went with the 6.0 head and immediately noticed an increase in power, I guess at least 25%. After asking and researching I opted for the 6:0 just because it wasn't that much more money. Very scientific approach I know. But was extremely pleased with the decision.
Remember with the new head you need less advance with the spark level. My 30 liked it at about the 9:30 position, a notch or two above horizonal for regular cruising. The engine temp will let you know where your "sweet spot" is.
"Enjoy the adventure"... Chap