I heard the xr400 cam is a direct bolt on to the 400ex, what power increase will this yield,i.e. low, mid, etc.

 

Yes, it's a drop in... Expect a little boost in the mid and top.

 

are there any other cams that are drop in, i.e no modification needed

 

Yes, several...

There's the HRC cam
The HRC copy from XR's only
The GT Thunder cam
The 450/451 grind from Web
the list goes on and on...

 

Can you drop in the white bros. track cam without any mods?

 

I have the white brothers catalog and it says there is no mods needed, so i believe you can drop it in

 

Which is the best drop in cam that dosn't require any mods

 

Gabe -

I noticed you expressed interest in the HRC cam. I figured I'd ask about it at the Honda dealer, and all they came up with was the complete HRC XR power-up kit (cam, piston, etc.); they wanted around $1300 for it. Do you know of a separate part number just for the HRC cam?

Thanks,
ogre

 

14000-NKK-000 -- $277.09 @ servicehonda.com

 

I say the best cam that doesn't require any mods, would be the GT Thunder cam.