Why are such large openings for the coolant flow/cooling circuit cast in cylinder heads (here at Volkswagen VR6) and parallel to this in the engine block below when the flow speed of the coolant is reduced by the use of a cylinder head seal (ZKD, here one of Victor Reinz) in such a measure that pressure bumps in the ZKD occur in high heat and the coolant inevitably pushes under the seal due to the pressure ??? Are the reductions in the ZK D intention to make the head ect. /stick seals/ventiles not so hot? What would happen if the existing openings were taken over by the cylinder head and engine block in the cylinder head seal 1:1? Can anyone contribute to this to the enlightenment? Thank you Greetings furniture box