A method for manufacturing a cylinder block (1, 1A) of a V-type engine in which a plurality of cylinder bores is provided in a V-type arrangement, characterized in that the method comprises: carrying out a thermal spraying process for forming a thermally sprayed coating on each inner surfaces of the plurality of cylinder bores following a cast process of the cylinder block (1, 1A), wherein the thermal spraying process includes: holding the cylinder block (1, 1A) by a clamp device; (21 a) generating stress in the cylinder block (1, 1A) by a holding force of the clamp device to duplicate deformations of the plurality of cylinder bores after assembling bearing caps thereon; carrying out boring with the plurality of cylinder bores that are deformed in a condition where the stress is generated, respectively; and after the boring and in the condition where the stress is generated forming the thermally sprayed coating on each inner surface of the plurality of cylinder bores that are deformed, wherein the cylinder block (1, 1A) is dismounted from the clamp device after the thermally sprayed coating is formed on each inner surface of the plurality of cylinder bores, wherein a crankshaft and the bearing caps are assembled on the cylinder block (1, 1A) after carrying out another work process or a test process, and wherein, after the other work process or the test process is carried out honing is carried out with the thermally sprayed coating formed on each inner surface of the plurality of cylinder bores of the cylinder block (1, 1A on which the crankshaft and the bearing caps are assembled, and wherein, for (21 a) generating the stress in the cylinder block (1, 1 A) by the holding force of the clamp device: - in a preliminary process an inner diameter of the plurality of cylinder bores is measured and - the deformations of the plurality of cylinder bores intentionally generated by the clamp device are controlled by adjusting the holding force of the clamp device based on the measured inner diameters in order to be equivalent to deformations at the installation of bearing caps. carrying out a thermal spraying process for forming a thermally sprayed coating on each inner surfaces of the plurality of cylinder bores following a cast process of the cylinder block (1, 1A), wherein the thermal spraying process includes: holding the cylinder block (1, 1A) by a clamp device; (21 a) generating stress in the cylinder block (1, 1A) by a holding force of the clamp device to duplicate deformations of the plurality of cylinder bores after assembling bearing caps thereon; carrying out boring with the plurality of cylinder bores that are deformed in a condition where the stress is generated, respectively; and holding the cylinder block (1, 1A) by a clamp device; (21 a) generating stress in the cylinder block (1, 1A) by a holding force of the clamp device to duplicate deformations of the plurality of cylinder bores after assembling bearing caps thereon; carrying out boring with the plurality of cylinder bores that are deformed in a condition where the stress is generated, respectively; and (21 a) generating stress in the cylinder block (1, 1A) by a holding force of the clamp device to duplicate deformations of the plurality of cylinder bores after assembling bearing caps thereon; carrying out boring with the plurality of cylinder bores that are deformed in a condition where the stress is generated, respectively; and after the boring and in the condition where the stress is generated forming the thermally sprayed coating on each inner surface of the plurality of cylinder bores that are deformed, wherein the cylinder block (1, 1A) is dismounted from the clamp device after the thermally sprayed coating is formed on each inner surface of the plurality of cylinder bores, wherein a crankshaft and the bearing caps are assembled on the cylinder block (1, 1A) after carrying out another work process or a test process, and wherein, after the other work process or the test process is carried out honing is carried out with the thermally sprayed coating formed on each inner surface of the plurality of cylinder bores of the cylinder block (1, 1A on which the crankshaft and the bearing caps are assembled, and wherein, for (21 a) generating the stress in the cylinder block (1, 1 A) by the holding force of the clamp device: - in a preliminary process an inner diameter of the plurality of cylinder bores is measured and - the deformations of the plurality of cylinder bores intentionally generated by the clamp device are controlled by adjusting the holding force of the clamp device based on the measured inner diameters in order to be equivalent to deformations at the installation of bearing caps. - in a preliminary process an inner diameter of the plurality of cylinder bores is measured and - the deformations of the plurality of cylinder bores intentionally generated by the clamp device are controlled by adjusting the holding force of the clamp device based on the measured inner diameters in order to be equivalent to deformations at the installation of bearing caps.