[en] Studies with the pion charge exchange reactions (π^+-,π⁰) at 164 MeV using the LAMPF π⁰ spectrometer are yielding new results on the existence and systematic features of isovector resonances in nuclei. These experiments possess an unusually high signal/background ratio for isovector resonances of low-multipolarity. Results obtained to date are: (1) observation and angular disribution measurement of the giant dipole resonance in nuclei ¹²C, ⁴⁰Ca, ⁹⁰Zr, and ¹²⁰Sn; and (2) observation and angular distribution measurements in the (π^-,π⁰) reaction on ⁹⁰Zr and ¹²⁰Sn of large signals possessing the expected angular distribution shapes and magnitudes for the isovector monopole resonance. Excitation energies are near the hydrodynamical model values 170 A^-13/ MeV. Differential cross sections are approximately 0.7 J₁²(qR) mb/sr. An overview of this experimental program, with emphasis on new results and how they correlate with existing knowledge on the isovector resonances, is presented