180cc Eliminator SBC Bare Cylinder Heads

The AFR 180cc "Street" Eliminator SBC Bare Cylinder Heads (MPN: AFR 0918NP) offer a significant performance enhancement over re-worked factory heads at a competitive price point. Constructed from A356 aluminum castings, these heads boast 100% CNC ported intake, exhaust, and combustion chambers for optimal airflow. They are engineered for street, towing, or street/strip applications, supporting engine displacements up to 383 cubic inches and operating effectively up to 6000 RPM. These cylinder heads meet emissions standards for 1994 and older vehicles under CARB EO #D-250-2. They feature a choice of 65cc or 75cc combustion chambers and a 64cc exhaust port. With a 3/4" thick head deck, they are well-suited for demanding applications like nitrous or blower setups. The design includes standard 2.020" intake and 1.600" exhaust valves with AFR's hardened ductile iron interlocking valve seats. The 23° valve angle and standard valve spacing make them an excellent choice for 1955-86 327 to 350 cid engines. For 1987 to present engines with center bolt valve covers and specific intake bolt configurations, AFR Part #0919 is available. Key specifications include a 180cc intake port volume, a 4.000" minimum bore diameter requirement, and a .750" deck thickness. The valve cover bolt pattern is the standard perimeter bolt type, and the valve angle is 23°. The valve spring pocket diameter is 1.460" O.D., with a maximum machining capability of 1.750" O.D. Note that angle mills may necessitate a .120" thick intake gasket. The heads come bare, requiring separate purchase of all necessary components.