diy porting will run you about a $100 in tools. but well worth it. i spent a easy 8 hrs per head. maybe a bit more with the valve lapping.

load of pics from my top swap. http://s1097.photobucket.com/user/sc...?sort=3&page=1

another folder of pics. http://s1097.photobucket.com/user/sc...?sort=3&page=1