My 06 CRF450R in getting some motor work done soon. I thinkin of going with HotRod crank (stock stroke), OEM piston, new valves/head work. Im considering the BigBoreThumpers bolt on head for $550. Then maybe sell my stock one for $100-200. Looking to build a bike that will be very strong, reliable, and last a long time. Whats everyone doing with your heads and valves? Mail it out to a shop? Do you use local shop? Whos a good shop to mail to?