AFR 335 BBC "As Cast" Rectangle Port Enforcer Heads

AFR Big Block Chevrolet "Enforcer" 335cc Rectangle Port Heads Air Flow Research's "Budget Friendly" cylinder heads AFR's 335cc big block Chevrolet "Enforcer" series cylinder heads feature our permanent mold “As-Cast” technology surfaces on the intake runners, exhaust runners and combustion chambers which allow for extremely accurate and repeatable port location and performance. This budget friendly head is perfect for your 509 to 540 cubic inch operating below 6500 RPM. They come fully assembled with the identical components found in our higher end CNC ported cylinder heads such as ARP rockers studs, PAC Racing springs, viton valve seals, AFR guide plates, machined bead valve locks (not stamped), hardened spring seats and our one piece 8mm 21 4N stainless steel valves. Sold as a PAIR of heads. Other valvetrain options are available at an extra cost. FEATURES: Intake Valve: 2.250" x 5.500" x 11/32" stemsExhaust Valve: 1.880” x 5.450” x 11/32" stemsPAC Racing 1940 hydraulic roller