CT or ESR Head

[tritty_wall]

I'm looking to get a bigger head for my R. Don't really want to get my case mechened so I was thinking of a CT 310 or A ESR 330 bolt on? I Mostly ride woods, some trail, and some sand? I Got a CT Midrange Pipe and Silencer on it way. Or is it really worth it the get my case done? What are your guys thoughts?

[Honda 250r 001]

depends on how much power you want! the 310 cylinder is a VERY solid cylinder. But, if you want to spend some more money, and have some more power. get the cases machined, yukon tranny gears, and the 330... But, you will loose some reliability on the bigger cylinders.