Design of concrete hollow block masonry subjected to lateral loading is controlled by appropriate permissible tensile stresses developed with respect to bed joints, ie, either normal or parallel to the bed joints, depending upon the direction in which the wall spans. There are wide variations between code provisions and many parameters have not been accounted for adequately, revealing the need for systematic investigation. As a first step, tests for flexural strength normal to bed joints of concrete hollow block masonry prisms in running bond have been carried out. The influences of full mortar bedding using conventional mortar mixes, the influence of plastering and grouting were investigated by using a bond wrench apparatus. Results show that the flexural bond strength increases with the richness of the bedding mortar mix proportion adopted, and observed to be higher than those specified by IS 1905. The plastering and grouting have significant effect in contributing to the flexural strength of masonry, and hence, these aspects need to be included in the design provisions.