Stock cylinders can make some pretty good power. We have all seen graphs on them. I'm not against them however since you are wanting more power now eventually down the road you will want more then what you have now even if you do ported stock cylinders. The serval would make a great trail motor. Good hp and trq right out of the box and then when you want more again you can port them and do better supporting mods instead of doing this whole setup later on. IMO when you wanna jump up on motor size and make more power, jump big so you save money down the road