Heat engine heater head assembly

A heater head assembly for a multi-cylinder heat engine, having at least two essentially discrete volumes of working gas, said heater head assembly comprising:

• a plurality of regenerator housings, each having a regenerator housing manifold,
• a plurality of cylinder extensions fluidly coupled to said plurality of regenerator housings, each of said cylinder extensions having a cylinder extension manifold,
• a heater head manifold, forming a surface with a plurality of heater tube openings, comprising first heater tube openings and second heater tube openings, and passageways between said first heater tube openings and said second heater tube openings,
• a plurality of heater tubes, comprising first heater tubes of identical construction and oriented parallel with respect to one another in a partially concentric array, and second heater tubes of identical construction and oriented parallel with respect to one another in a partially concentric array, each of said first heater tubes extending between one of said regenerator housing manifolds and one of said first heater tube openings and each of said second heater tubes extending between one of said cylinder extension manifolds and one of said second heater tube openings, thereby allowing said working gas to be shuttled between said regenerator manifolds and said cylinder manifolds through said first heater tubes, said heater head manifold and said second heater tubes and allowing said working gas to absorb heat, and
• said regenerator housing manifolds, said cylinder extension manifolds, said heater head manifold and said heater tubes being fabricated from a single superalloy material.