for the best results, might want to send your cylinders out. jim at passion does any style porting including a bore job for 375, and gives a nice deal on a piston kit, lot of people recommend him. you've also got patriot racing, they have a nice dune port, might want to check them out also, but I hear they are busy all the time. theirs alot of other places, just narrow it down to what builder you want to go with. personally i'd go with either passion or patriot, anyone else with good dune ports please chime in. damn your in vacaville? pretty close, im in the bay area, san leandro area. i go to carnegie, hollister, and pismo. how far out is dumont and sand mountain? wanted to go to both fo the 2 because me and a few only been to pismo dunes, want to see some bigger stuff. want to go out to glamis too.