STOCK Trick Flow BBC 280cc Aluminum Cylinder Head Big Block Chevy 113cc. This product data sheet is originally written in English. These are the TFS PowerPort 280cc intake runner aluminum heads with 113cc chambers, chromoly retainers. And a max lift of. Looking for serious Big-Block horsepower? Efficient heart-shaped combustion chambers have CNC profiled bowl blended valve seat transitions to promote high velocity and huge airflow volume, plus 24 degree valve angles with 4 degree side cants to further increase airflow. 300 raised exhaust ports, and extra-thick decks and walls for porting. Accessory Bolt Holes Drilled. Combustion Chamber Volume (cc). Exhaust Runner Volume (cc). Exhaust Valve Diameter (in). Intake Runner Volume…