Even on this video a low cr 360 the xe250h and xe268h cams are doing similar/better than stock cam @ 2500 rpm and up, and yes the two comp cams aren't also taken down to 2000 rpms like stock was but looks like they be in the same general ballpark and yes there's a difference in head work between the stock and comp cams but I don't see huge signs bottom end gonna fall off.