need some advice w/ my rebuild

[flat_track400ex]

ok i race flat track and there is a guy who has a stroked 400 and it flys he is beating the 450s so i am gonna stroke mine i was gonna jsut gonna do a 426 kit w/ cam and carb but sould i still do a 426 or go w/ the 440since i'm stroking it. I wasnt sure cuz i was told not to get a 440 since i'm racing flat track and also what cam soujld i invest in which would give me more power for flat track and TT?

do you know what he has? It takes ALOT to make a 400ex keep up with a STOCK 450r....maybe hes just a really good rider

[flat_track400ex]

i think he has a 465
these are yfz running were i race

[EPDP99]

440 is just a big bore. I have a 465 done by trinity racing and it will smoke the 450s. Its a 440 bore stroked to 465. It has all mods possible. The only thing is it runs hot. Im in the proccess of building a bigger oil cooler kit for it. So when you build it take into consideration that all has to be done as well. Once i get oil tank and build my system I will let everyone know how it helped.