The Mad Scientist did my 421 cub...
Butch (00tbanshee) can attest to how it runs. Very similar to his, but mine was "custom made" like Kevin describes he does to my liking.
Let me tell you, I told him what I wanted, and he did it. I was told by 99.9% of people that the type of riding I do, a cub cannot, or cannot be made, to be the ideal setup.
Kevin prooved all the doubters wrong, and made my motor one sick death wish of a machine. If I do grow the set and want more, he will give the motor another wakeup. I guarantee it. As with anyone else's. He is a step ahead and for good reason.
Yes, tuning means alot. But you have to tune anything. Stock, piped, ported, cub, doesn't matter. Tune it and hold on.
Kevin will have my motors from here on out. He treats me good, always likes to shoot the bull about the motor, and never makes me feel like he doesn't have the time. He's flat out a good guy to deal with.
Ship a motor with confidence. Tell him what you want, and get what you want. Have no doubts.