385cc BBC CNC Aluminum Cylinder Head Flow Chart Tested on a 4.600 Bore Basic Package Components 100% CNC Ported Intake Ports, Exhaust Ports, & Combustion Chamber Competition 5-angle... items AFR 385cc Fully CNC Ported Magnum BBC Cylinder Heads AFR s Magnum Series As the aftermarket continues to push larger displacement combinations, even 555 CID BBC s are becoming... selecting the right cylinder head depends on a large number of variables. Please consult with one of our sales technicians to assist you in making the best choice for your...