A method for producing perfect-bound book blocks for books or similar printed products, including driving successively arranged clamps to circulate along an endless path of a perfect binding apparatus, positioning loose book blocks composed of gathered printed sheets inside conveying units of a conveying device, supplying the book blocks upon or prior to reaching the transfer region below the endless path to the clamps of the perfect binding apparatus, the supplying including inserting the book blocks into the clamps pivoted by approximately 90° around a perpendicular axis from a processing position for the book blocks and clamping the book blocks in the clamps with spines facing downwards, and transporting the clamped book blocks in an upright position for further processing in the perfect binding apparatus. An arrangement for producing perfect-bound book blocks is also provided.