Afr 265cc Bbc Oval Port Cylinder Heads, Cnc Chamber, Solid Roller Springs

AFR's 265cc Magnum "As Cast" Oval Port heads with solid roller springs 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 7200-7400 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 race vehicle? AFR's 265cc high velocity oval port 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. This Race Ready upgrade includes PAC Racing Spring 1.550 O.D. Solid Roller Valve Spring, 220lbs on seat, .710" Maximum Lift, Max RPM 7200-7400 (upgrades available) and CNC Chambers.  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 Part # 75% CNC Ported Exhaust Ports (Bowl Blend) 
80% CNC Ported Intake Ports (Bowl Blend)
100% CNC Chambers
Competition 5-angle Valve Job   11/32" Intake Valve, 2.190" x 5.460" Overall Valve Length AFR #7601 11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length AFR #7630 PAC Racing Springs 1.550” OD Solid Roller Dual Valve Drag Race Spring, 220 lbs. on seat, .710” maximum lift, - 260* max recommended duration, Max RPM 7200-7400 (upgrades available) AFR #8000 PAC Racing #1940 1.550” OD Hydraulic Roller Dual Valve Spring, 175 lbs. on seat, .725” maximum lift, Max RPM 6500-6700 AFR #8002 10° Steel Retainers 1.500" O.D x 1.120"I.D x .705" I.D AFR #8511 10° 11/32" Valve Keepers with lashcap recess AFR #9005 ARP 7/16" Rocker Studs Intake AFR #6407 ARP 7/16" Rocker Studs Exhaust AFR #6406 Adjustable 3/8" Guide Plates AFR #6109 11/32" Viton Valve Seals AFR #6613 Hardened Valve Spring Cup 1.655" O.D x 1.565" I.D – For 8002 Spring AFR#8044 Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D - For 8000 Spring AFR #8048 Intake Valve Seats 2.450" O.D x 1.950" I.D x .375" Deep AFR #9065 Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep AFR #9064 11/32" Intake Bronze Valve Guides .502" O.D x 2.10" O.A.L AFR #9041 11/32" Exhaust Bronze Valve Guides .502" O.D x 2.25" O.A.L AFR #9042
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.