AFR 325cc Enforcer Cylinder heads for the Big Block Chevrolet feature Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows 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 higher end CNC ported cylinder heads; including ARP rockers studs, PAC Racing springs, viton valve seals, AFR adjustable guide plates, machined bead valve locks, hardened spring seats and ductile iron seats in addition to one piece 8mm 21-4N Stainless Steel valves. They are available without any parts if you prefer to set them up in-house. Sold as a single piece, 2 are required per engine.
