redhat stock kernels are not the best (opinion) if you feel up to it read a kernel compiler tutorial, not as hard as it sounds:
1) download source at
www.kernel.org
2) cd /usr/src/
3) tar -zxvf kernel-x.x.x.tar.bz2
4) rm linux && ln linux-x.x.x.tar.bz2 linux -s
5) cd linux
6) make mrproper && make menuconfig
7) configure what you know leave rest at default
8) make dep && make clean && make bzImage && make install && make modules && make modules_install && lilo
9) reboot