How much does an aluminum manifold weigh compared to a cast iron intake manifold?

An aluminum manifold typically weighs significantly less than a cast iron intake manifold. While an aluminum manifold may weigh around 10 to 25 pounds, a cast iron intake manifold can weigh anywhere from 30 to 70 pounds or more, depending on the design and size. This weight difference contributes to improved engine performance and efficiency, as aluminum reduces the overall weight of the vehicle.