Here’s a pic of a corroded and pitted aluminum cylinder head surface and a cast iron cylinder of a small block Chevy engine. We see a fair amount of pitting and corrosion with both aluminum as well as cast iron heads and blocks. The pitting can simply come from bad antifreeze coolant that has broken down or from a mix with more water, particularly hard water, than antifreeze. Another major cause of corrosion is from electrolysis which is promoted by not only bad or broken down antifreeze but also from not having good ground connections.
Motor Mission Machine & Radiator 5435 Desert Point Dr. Las Vegas, Nv. 89118 Phone: (702) 649-2366 or (702) 649-0648 Fax: (702) 649-4133 www.MotorMission.com Facebook.com/MotorMission