Allyl radical reactions with NO and NO2 were studied in direct, time-resolved experiments in a temperature controlled tubular flow reactor connected to a laser photolysis/photoionization mass spectrometer (LP-PIMS). In the C3H5 + NO reaction 1, a dependence on the bath gas density was observed in the determined rate coefficients and pressure falloff parametrizations were performed. The obtained rate coefficients vary between 0.30-14.2 x 10(-12) cm(3) s(-1) (T = 188-363 K,p = 0.39-23.78 Torr He) and possess a negative temperature dependence. The rate coefficients of the C3H5 + NO2 reaction 2 did not show a dependence on the bath gas density in the range used (p = 0.47-3.38 Torr, T = 201-363 K), and they can be expressed as a function of temperature with k(C3H5 + NO2) = (3.97 +/- 0.84) x 10(-11) x (T/300 K)(-1.55+/-0.05) cm(3) s(-1). In the C3H5 + NO reaction, above 410 K the observed C3H5 radical signal did not decay to the signal background, indicating equilibrium between C3H5 + NO and C3H5NO. This allowed the C3H5 + NO (sic) C3H5NO equilibrium to be studied and the equilibrium constants of the reaction between 414 and 500 K to be determined. With the standard second- and third-law analysis, the enthalpy and entropy of the C3H5 + NO (sic) C3H5NO reaction were obtained. Combined with the calculated standard entropy of reaction (Delta S-298 degrees = 137.2 J mol(-1)K(-1)), the third-law analysis resulted in Delta H-298 degrees = 102.4 +/- 3.2 kJ mol(-1) for the C3H5-NO bond dissociation enthalpy.