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Extruded ceramic honeycombs are used as substrates for catalytic converter in automotive emission control. The low thermal expansion and thus high thermal shock resistance(TSR) of cordierite honeycomb monoliths are important since monoliths have to withstand severe thermal stresses during the use. Besides thermal expansion, flexural strength and modulus of elasticity are the factors effecting TSR. To meet the demanding requirement of high conversion efficiency with low pressure drop and long durability, the honeycombs of variety of cell density and wall thickness are designed. Various Cordierite honeycombs are extruded and thermal properties are studied and correlated with calculated values and presented in this paper. The thermal expansion is measured in two directions, using a Dilatometer. Anisotropy in thermal expansion is observed in all the samples. Thermal expansion is found to be low along the channels and high across the wall.