Cylinder head and flow restrictor plug for a cylinder head

A cylinder head for an internal combustion engine comprising:

• a casting defining a first fluid circuit, a second fluid circuit, and a chamber, wherein (i) the first fluid circuit is configured to operate at an increased fluid pressure relative to the second fluid circuit, (ii) the first fluid circuit intersects a central portion of the chamber, (iii) the second fluid circuit intersects a first end of the chamber, and (iv) a second end of the chamber defines an opening along an exterior surface of the casting;
• and
• a plug disposed within the chamber, the plug having (i) a distal end that engages the casting along the first end of the chamber via a slip-fit engagement, (ii) a proximal end that engages the casting along the second end of the chamber via a threaded engagement, and (iii) an intermediate portion that is spaced apart from the casting along the central portion of the chamber, and wherein the plug defines (i) an internal channel that establishes fluid communication between the first and second fluid circuits and (ii) a restrictor orifice that limits a fluid flow rate through the internal channel.