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The Q-value of the ⁴⁸Ca(¹⁸O, ¹⁷C)⁴⁹Ti reaction, studied at E(¹⁸O) = 102 MeV, θ ~ 8°, leads to an atomic mass excess of 21.023 ± 35 keV. A group is also observed corresponding to an excited state of ¹⁷C with E_x = 292 ± 20 keV. Three closely spaced states with J^π = 1/2⁺, 3/2⁺, 5/2⁺ are predicted, based on systematics. The cross sections for formation of ¹⁷C*(0, 0.29) are 3 and 9 μb/sr, respectively, at θ_cm = 10.5° (NO77C). On the basis of the atomic mass excess given above, E_β^-(max) to ¹⁷N_g.s. = 13.15 MeV. ¹⁷C is stable with respect to ¹⁶C + n by 0.74 MeV. The Q-value of the ²⁰⁷Pb(¹⁸O, ¹⁷C)²⁰⁸Po reaction is -26.87 ± 0.22 MeV, leading to a mass excess of 21.10 ± 0.22 MeV for the ground state (doublet) of ¹⁷C (BA79AA). See also (77AJ02) and (AR77B, AL80H).