Water jacket for cylinder head

A water jacket for a cylinder head, comprising:

• an upper body disposed at an upper part of the cylinder head inside the cylinder head, a coolant flowing through the upper body;
• a lower body disposed under the upper body inside the cylinder head, the coolant flowing through the lower body;
• and
• a connector disposed corresponding to a position of an exhaust valve between the upper body and the lower body and integrally connected to the upper body and the lower body,
• wherein the connector has at least one penetration hole along a length direction,
• wherein the lower body includes:
• a plurality of inflow protrusions for each combustion chamber along the length direction at a lower surface corresponding to a position of the connector;
• and
• a plurality of exhaust protrusions for each combustion chamber along the length direction at a position facing the plurality of inflow protrusions by corresponding to a position of an intake valve.