425 vs. 440

[Sammy_P_Racing]

I am curious as to how a 425 engine kit fully loaded with a 11:1 piston, cam, porting, and bore would hold up against a 440 on mx tracks?

[roostin_dale]

i think it will do great. and if the motor ever blows you have room to go bigger.

Wait for some other people to reply...i dont know alot about 400ex engines...