[CentOS] Upgrading to 2.6.11

What would be the proper steps to upgrade to 2.6.11 on centos 4.0

This is what I think...

                tar -zxvf linux-2.6.11.6.bz2
                cd linux-2.6.11.6
                make oldconfig             - enter for all choies presented
                vi .config                     - change 8250_NR_UARTS to 
36 to support 4 - 8 port rs232 cards
                make bzImage
                make modules_install
                mkinitrd /boot/initrd-2.6.11.6 2.6.1.6
                cp -f arch/i386/boot/bzImage /boot/vmlinux-2.6.11.6
                edit /etc/grub.conf

Is this the correct procedure?

Thanks,

Jerry