Aluminum Cylinder Heads are a great choice for racing and higher horsepower street applications. Aside from being made out of aluminum and being lighter then their Cast Iron counterparts Aluminum Heads offer greater heat dissipation allowing for higher compression to be used in street applications. Traditionally CNC machined with smoother surfaces especially in the ports allows for a much greater airflow thereby increasing the chances of creating much greater horsepower out of the box.
Heavier than their Aluminum counter-parts but great for the price and class conscience while still maintaining the ability to create Low to medium horsepower. These are the perfect choice for those not needing to create X-Extreme horsepower.