Afr 290cc Bbc Oval Port Cylinder Heads, Cnc Ported, No Parts

AFR's 290cc heads feature 100% CNC ported intake, exhaust and chambers, A356 aluminum castings and high quality components throughout. Recommended for moderate street, or street/strip builds with displacements up to 509 cubic inches, operating up to 6500 RPM. Component upgrades and machining options are available to customize AFR Heads to your specific build.
The Ultimate Street Weapon!
For the ultimate in "Oval Port" performance, the fully CNC ported AFR 290 has no competition. With flow figures most small to medium sized rectangular port castings would be envious of, these high flowing "Ovals" produce tremendous airspeed and really pack a punch. AFR has included it's trademark 3/4" deck, reinforced rocker stud bosses, and thick rugged castings, so you can own the strongest and most efficient heads on the market today. Premium hardware all come as standard equipment. 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.

Note:
1" longer head bolts needed on four bottom exhaust bolt holes. Angle mills might require a .120" Thick intake gasket.
Included Components   100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
100% CNC Ported Combustion Chambers
Competition 5-angle Valve Job  
Recommended Components Intake Port Gasket AFR #6863 Exhaust Port Gasket AFR #6858 Head Gasket Fel-Pro #1047 (Mark V and VI) or AFR #6849 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 Manley, AFR #6320 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 290cc Intake Port Dimension 2.030"H x 1.830"W x1/2 Radius Intake Port Location Stock Exhaust Port Volume 135cc Exhaust Port Dimension 1.770"H x 2.010" W Exhaust Port Location .375" Raised 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 4.250" Flat Mill .006" per cc/ Maximum 102cc Angle Mill .009" per cc/ Maximum 97cc Minimum Cross Sectional Area 2.895 sq. in. Spark Plug Dimensions 14mm x .750" w/Gasket Seat Important:
Do not port match you 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.