Afr 265cc Bbc Oval Port Cylinder Heads, Cnc Chambers, No Parts

AFR's 265cc Magnum "As Cast" Oval Port heads are the preferred choice over reworked factory heads. They feature partially CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for street, towing, or street/strip engines with displacements up to 468 cubic inches, operating up to 6200 RPM. Also available with 100% CNC chambers for increased air flow (see chart). Component upgrades and machining options are available to customize AFR Heads to your specific build.
Small Port, High Velocity, Torque Monster!
Want to wake up the Big Block in your favorite tow vehicle? AFR's 265cc high velocity oval port and CNC Chambers is just the ticket! They are also ideal on smaller cubic inch street performance applications (up to 468 CID), providing “gobs” of bottom end torque, tremendous throttle response, and great all around power. With AFR’s trademark 3/4” deck, reinforced rockerstud bosses, and thick rugged castings, you can own the strongest and most efficient heads on the market today. Take note the higher flowing exhaust ports are raised .375 over stock location, and therefore these heads might not be a direct bolt-on in every application. These heads have no EGR and are not emissions legal. Included Components   75% CNC Ported Exhaust Ports (Bowl Blend)
80% CNC Ported Intake Ports (Bowl Blend)
100% CNC Chambers
Competition 5-angle Valve Job  
Recommended Components Intake Port Gasket AFR #6863 Exhaust Port Gasket AFR #6858 Head Gasket  Fel-Pro #1017-1 (Mark IV) or AFR #6850 Head Gasket  Fel-Pro #1047 (Mark V and VI) or AFR #6849 Head Bolts ARP 135-3703 (Mark IV) or AFR #6306 Head Bolts ARP 135-3707 (Mark V) or AFR #6308 Head Studs ARP 235-4713 or AFR #6307 Head Bolt Washers Manley, AFR #6320 Stud Girdle, (AFR Specific) AFR #6202 7/16 Stud Mount Rocker Arms - 1.7 Ratio (For Optimized Geometry) AFR #6043 1.7 Shaft Mount Rocker Arms T&D AFR #6065 Shaft Mount Rocker Arms Crower or Jesel Pro Series Suggested Manifold Victor Jr Suggested Manifold RPM Performer Suggested Manifold Air Gap #7561 Spark Plug Starting Range Autolite 3924 Specifications & Features Material A356 Aluminum Intake Port Volume 265cc Intake Port Dimension 2.030"H x 1.830"W x1/2 Radius Intake Port Location Stock Exhaust Port Volume 132cc Exhaust Port Dimension 1.770"H x 2.010" W Exhaust Port Location .375" Raised Combustion Chamber Size (Partial CNC) 109cc Combustion Chamber Size (Full CNC) 112cc Valve Cover Bolt Pattern Perimeter Bolt Valve Angle 24°/4° Int, 15°/4° Exh Valve Spring Pocket Diameter 1.725" O.D Max Valve Spring Pocket Machining 1.750" O.D Deck Thickness .750" Minimum Bore Diameter 4.125" Flat Mill .006" per cc/ Maximum 102cc as cast or CNC chamber Angle Mill .009" per cc/ Maximum 97cc as cast or CNC chamber Minimum Cross Sectional Area 2.640 sq. in. Spark Plug Dimensions 14mm x .750" w/Gasket Seat IMPORTANT: 
Do not match your intake manifold to any Fel-Pro gasket as it does not precisely match AFR heads. 
Do not use your AFR gasket as a template to port match your intake manifold as one AFR gasket is used for many AFR runner volumes.

NOTE: 
1" longer head bolts needed on four bottom exhaust bolt holes. 
Milling head deck will affect flow numbers. Angle mills might require a .120 thick intake gasket.