These Ford Racing Aluminum Engine Blocks use the latest technology to help Maximize reliability. They feature a Chilled Bulkhead casting process for a Stronger Main Web, and Round Main Web Windows to reduce Stress Areas for Potential Failure. The Ford Racing Aluminum Engine Blocks also have Ball-Burnished Main Caps for High Strength and Rigidity and accept most production Aluminum Block Accessories. At just 129 lbs. or more, these Ford Racing Aluminum Engine Blocks can save weight and give you an incredible foundation for your High-horsepower Ford Engines.