AFR BBC Aluminum Heads Rectangular Port 385cc Assembled

AFR BBC aluminum heads rectangular port flowing 385cc with 2.350 Intake/ 1.880 exhaust valves with a 24 degree valve angle. These heads are best suited for large displacement (540+ cubic inches) high RPM big block chevrolet racing engines. Big Block Chevy Cylinder Head Magnum Comp  Assembled 2.350 / 1.880 in Valves 385 cc Intake 121 cc Chamber 1.625 in Springs 24 Degree Valve Angle  Aluminum  Pair  Lift  .200 .300 .400 .500 .600 .700 .800 .900 Int 169 249 312 359 411 428 439 449 Exh 139 190 245 280 299 309 315 321 Test conducted at 28" of water (pressure) on Superflow 600Bore Size: 4.600", intake 3/4" radius plate exhaust, 2 1/8" curved pipe