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Message: [QUOTE="lwsmithjr, post: 1127039, member: 35074"] If you want to maintain the top end, go with mid to top porting. The overbore gives you more bottom. However, it did lose some over-rev. The bore to stroke ratio is higher than the stock motor so the extreme upper end of the rev range is affected (I'm guessing that's why Eric stroked his). But the pull of the motor is so strong, it is very obvious when you should shift - and when you do, it just starts pulling again. We decided to stay with pump gas -- Eric said we could see even more gains had we chosen to go race gas, but we did not want to be stuck [I]having[/I] to run race gas. If we were attempting to hit all of the big nationals with it, we might have thought differently. But we play as much as we race these days. [/QUOTE]