AFR LS3 Heads 260cc Mongoose 6 Bolt Assembled

AFR LS3 Heads 260cc mongoose assembled cylinder heads with an 69cc combustion chamber and 2.165 intake/ 1.600 exhaust valves, They’re designed for 4.000 or larger bore applications up to 454 CI, operating up to 7000 RPM. GM LS3/LS99 Cylinder Heads  LS3 Mongoose Assembled  2.165 / 1.600 in Valves 260 cc Intake  69 cc Chamber 1.270 in Springs 6 Bolt CNC Ported 12 Degree Valve Angle  Aluminum Pair 260cc Large Bore Competition Flow Chart   .200 .300 .400 .500 .600 .650 .700 Int 159 234 293 336 366 377 384 Exh 112 158 207 235 248 251 255 Test conducted at 28" of water (pressure) on Superflow 600Bore Size: 4.060", intake 3/4" radius plate exhaust, 1 3/4" curved pipe