Large-scale CIV3 calculations are performed for theexcitation energies from the ground state for 53fine-structure levels as well as for some oscillatorstrengths and radiative decay rates forelectric-dipole-allowed and intercombination transitionsamong the levels of the terms(1s22s22p6)3s23p(2Po), 3s3p2(2S,2P,2D,4P),3s23d(2D), 3p3(4So, 2Po, 2Do), 3s3p(3Po)3d(2Po,2Do, 2Fo, 4Po, 4Do, 4Fo), 3s3p(1Po)3d(2Po,2Do, 2Fo),3s24s(2S), 3s24p(2Po), 3s24d(2D),3s24f(2Fo), 3s3p(3Po)4s(2Po, 4Po) and3s3p(1Po)4s(2Po) of Fe XIV and Ni XVI. In this calculation, alarge number of configurations which include up to n = 5 orbitals are used toensure convergence. The important relativistic effects in intermediatecoupling are incorporated by means of the Breit-Pauli Hamiltonian. Ourcalculated excitation energies, including their ordering, are in excellentagreement with the available experimental results for both Fe XIV and Ni XVI. We also predictnew data for Ni XVI for the levels arising from the configurations with n = 4 orbitals where thereare no theoretical or experimental results available. From our transition probabilities, we havecalculated radiative lifetimes of the high-spin levels3s3p2 4P and3s3p3d 4Fo. A large difference in the lifetime (about a factor of four) ofthe latter level of Fe XIV between our calculatedvalue (using our adjusted energies), on the one hand, andthe experimental result of Trabert et al and othertheoretical calculations, on the other hand, is explainedthrough subtleties in the energy values. The newpredicted lifetime for the 3s3p3d 4F3/2level of Fe XIV could have interestingimplications for ion laser investigations.