AFR BBC Aluminum Heads Rectangular CNC Port 325cc Assembled

AFR bbc aluminum assembled magnum comp cylinder heads with 2.300 intake/ 1.880 exhaust valves. Recommended for more aggressive street, or street/strip builds with displacements up to 540 cubic inches, operating up to 6800 RPM. Big Block Chevy Cylinder Head Magnum Comp Assembled 2.300 / 1.880 in Valves 325 cc Intake  121 cc Chamber 1.625 in Springs 24 Degree Valve Angle Aluminum P/N 2101-1 Pair 325cc w/ 100% CNC Chamber Flow Chart  Lift .200 .300 .400 .500 .600 .700 Int 155 227 281 319 346 368 Exh 135 195 240 254 262 266 Test conducted at 28" of water (pressure) on Superflow 600Bore Size: 4.310", intake 3/4" radius plate exhaust, 2 1/8" curved pipe