The Ultimate Stress Test. Part 4 takes the REEN 4-valve project to the engine dyno for its most critical validation yet. We’re not just chasing peak horsepower; we’re proving that air-cooled 3D-printed technology can handle the world’s toughest circuits. Watch the freshly printed cylinder heads endure a simulated full-throttle lap of Spa-Francorchamps. We’re pushing for GT3-level thermal stability and performance, capturing every data point from Eau Rouge to the Blanchimont straight. This is where engineering meets reality. What’s inside: • Simulated Lap: A full-load run of Spa-Francorchamps on the engine dyno. • Thermal Endurance: Can the 4-valve head stay cool under racing conditions? • The Data: Real-time performance curves.