The objective of this study is to investigate whether there is significant spatial variability in the mechanical properties of Gilsocarbon nuclear graphite at different sections of the billet; specifically the dynamic Poisson's ratio, dynamic shear modulus, dynamic Young's modulus and density. Similar studies have been done, usually in the context of manufacturing, to assess the quality of graphite components for nuclear reactors. In this new study, the measurements have been carried out at a much higher spatial resolution than has previously been studied. A Torness/Heysham B billet was machined into cubes so that measurements could be made across the circumference and height of the billet. The spatial variability of material properties is described and analysed statistically. The study shows that material variability is present at different heights and circumferential locations of the billet. ASTM engineering standards were followed to assess the measurements of the samples. This work will be of interest to researchers and practitioners who use material property values in computer programs for predicting the structural integrity and through life performance of graphite components.