This paper provides eighty-four PvTx data points for binary 800 blends of trans-1-chloro-3,3,3-trifluoroprop-1-ene (R1233zd(E)) and iso-butane (R600a) in the vapor phase and ninety-seven PvTx data points for 600 binary blends of cis-1,3,3,3-tetrafluoroprop-1-ene (R1234ze(Z)) and R600a in the vapor phase. The R1233zd(E)/R600a data were recorded along six isochores (0.0499, 0.0536, 0.0927, 0.1263, 0.1431, 0.1744) m(3).kg(-1) for temperatures (303 < T < 383) K for six R600a mole fractions (0.125, 0.453, 0.564, 0.644, 0.746, 0.865). The R1234ze(Z)/R600a blends were recorded along five isochores (0.0759, 0.0907, 0.1272, 0.1288, 0.1520) m(3).kg(-1) for temperatures (303 < T < 388) K for six R600a mole fractions (0.118, 0.222, 0.427, 0.510, 0.658, 0.725). The data were regressed using several equations of state.