Australian Conflux Technology has partnered with racing car manufacturer Dallara to develop a liquid hydrogen-to-coolant heat exchanger for next-generation hydrogen combustion engine endurance race cars. The ongoing pre-study focuses on cryogenic thermal management challenges, including preventing coolant freezing at ultra-low temperatures, controlling hydrogen embrittlement risks, and optimizing weight and thermal performance within extreme space constraints. Additive manufacturing enables complex internal geometries. This heat exchanger is a critical subsystem for liquid hydrogen storage and delivery, directly impacting pump selection, system packaging, total mass, and integration with existing cooling loops. The project supports the 24 Hours of Le Mans organizer's hydrogen roadmap toward 2030, aiming to provide future manufacturers and teams with a proven liquid hydrogen ICE technology platform. Conflux's additive manufacturing heat exchanger capabilities complement Dallara's race car systems engineering expertise, representing a frontier breakthrough in additive manufacturing for extreme thermal management applications.