utah, thanks for your response.where were you when i asked this question a while ago.<has any one tried this cam?>i was just going with what pam from poweroll told me about the rockers.i didnt want to take a chance and screw things up.so how is the xr400 cam? better low end top or what?what other mods do you have with this cam?

 

what did it make different? It made a big difference putting a 250x cam in a 300ex. Seemed to give more low and mid power. What does the xr cam do to the 400ex?

 

Sorry racerx, when I first read your post I was still in the research stag of the mods for my 400. The XR cam works great.