AFR - Airflow Research 2020-TI: 385cc Rectangle Port 24° Magnum Aluminum Cylinder Heads Big Block Chevy
385cc Rectangle Port 24° Magnum Aluminum Cylinder Heads Big Block Chevy 121cc Combustion Chambers 1.625'' Valve Spring 275 lbs. Seat Pressure .850'' Max Lift Assembled Sold in Pairs, 2/pkg.