Brand: Airflow Research (AFR) Manufacturer's Part Number: 3660 Part Type: Cylinder Heads Product Line: AFR 300cc Magnum BBC Cylinder Heads Automotive Fittings Part Number: AFR-3660 Combustion Chamber Volume (cc): 112 Intake Runner Volume (cc): 300cc Exhaust Runner Volume (cc): 135cc Cylinder Head Style: Bare Cylinder Head Material: Cast aluminum Intake Port Shape: Rectangular Intake Valve Diameter (in.): 2.400 in. CNC-Machined Combustion Chamber: Yes CNC-Machined Intake Runner: Yes CNC-Machined Exhaust Runner: Yes Combustion Chamber Style: Open chamber Intake Port Location: Standard Exhaust Port Shape: Round Exhaust Port Location: Raised Intake Valves Included: No Exhaust Valves Included: No Exhaust Valve Diameter (in.): 1.880 in. Valve Springs Included: No Damper Spring Included: No Retainers Included: No Locks Included: No Valve Stem Seals Included: No Rocker Arm Studs Included: No Rocker Arms Included: No Rocker Arm Nuts Included: No Guideplates Included: No Accessory Bolt Holes Drilled: Yes Intake Valve Angle: 24 Exhaust Valve Angle: 15 Valve Guides Included: Yes Valve Guide Material: Manganese bronze Valve Seats Machined: Yes Valve Seat Machine Style: 5-angle intake/3-angle exhaust Valve Seat Material: Ductile iron Cylinder Head Color: Natural Steam Holes Drilled: No Oiling Style: Through head Machined for O-Ring: No Heat Crossover: No Remanufactured: No Quantity: Sold as a pair. Description: AFR 300cc Magnum BBC cylinder heads are suggested for aggressive builds. They boast 100 percent CNC-ported intake, exhaust, and chambers—as well as A356 aluminum casting and high-quality components throughout. These oval port competition packages are available with hydraulic or solid roller springs; and bare or assembled style.
