Cylinder jacket and manufacturing method for internal combustion engine. Cylinder jacket can generally include cylinder, be configured to receive piston component. The cylindrical body can further comprise configuring to be configured in support cylindrical body engine bore with the main part and upper flange that are selectively engaged with engine hole. Main body further defines the adjacent undulated cooling duct of upper flange. The wavy cooling oil duct generally defines the periphery cylindrical body of the single coolant flow path of extension.
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