  The dispersion of the Cu-O bond-stretching vibrations in overdoped
La$_{1.7}$Sr$_{0.3}$CuO$_4$ (not superconducting) has been studied by high
resolution inelastic neutron scattering. It was found that the doping-induced
renormalization of the so-called breathing and the half-breathing modes is
larger than in optimally doped La$_{1.85}$Sr$_{0.15}$CuO$_4$. On the other
hand, the phonon linewidths are generally smaller in the overdoped sample.
Features observed in optimally doped La$_{1.85}$Sr$_{0.15}$CuO$_4$ which
suggest a tendency towards charge stripe formation are absent in overdoped
La$_{1.7}$Sr$_{0.3}$CuO$_4$.
