Cylinder heads for the 2007.5–2018 6.7L Cummins Marine engine seal the top of the cylinders. They manage airflow, fuel delivery, and exhaust flow. Built from strong cast iron, they handle high pressure and heat. These heads support a 24-valve setup for better breathing and power. Designed for marine use, they resist corrosion and wear. They work well for stock rebuilds or performance upgrades.