[CentOS] Booting custom kernels in centOS6.0

Hi,   I'm using the procedure described in building customer kenrels centOS5.0.   Except for one step where spec file to comment 25 lines from 638, I did every thing. I got rpm files in ~/rpmbuild/RPMS. After installing kernel-firmeware, kernel, kernel-headers, kernel-devel packages it creates OS entry in /boot/grub/menu.lst following "defaults 0" directive.   After reboot: 1. Grub is not showing up new kernel in grub menu 2. Manually removing old kernel title in menu.lst, won't booting new kernel.   kernel: 2.6.32.71.el6.x86_64.   Are there any issues?   thanks and regards, Viswa