AFR 290cc Oval Port Magnum CNC BBC Head

Sale: $3,091.03
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AFR 290cc Oval Port Magnum BBC Head

The Ultimate Street Weapon


BBC 290cc Oval Port Cylinder Head
Click to enlarge

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. Ideally suited for 396-509 CID street and strip performance, as well as circle track applications which require strong low and mid-range torque to help accelerate a car coming off a corner. Once again, 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 such as 2.250/1.880 one piece stainless valves, 1.625 double springs, 10 degree locks and retainers, and high quality studs and guideplates 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.



Optional stud girdle required for 2° rolled valve angles and 1” longer head bolt needed on four bottom exhaust bolt holes.
(see footnotes here)

290cc BBC Aluminum Cylinder Head Flow Chart

Tested on 4.310 Bore

290cc BBC Cylinder Head Flow Chart


Basic Package Components
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
100% CNC Ported Combustion Chambers
Competition 5-angle Valve Job
AFR #7620Intake Valve, 2.250" stainless steel
AFR #7630Exhaust Valve, 1.880" stainless steel
AFR #80021.550 O.D. Hydraulic Dual Valve Spring w/ dampener 165 lbs. on seat, 430 lb open
AFR #80001.550 O.D. Solid Roller Valve Spring, 225lbs on seat, .710 Maximum Lift
AFR #851810° Chrome Moly Retainer
AFR #900510° Valve Locks
AFR #6109Guide Plates
AFR #6611Viton Valve Seals
AFR #8048Hardened Spring Cup
AFR #9065Intake Valve Seats
AFR #9064Exhaust Valve Seats
AFR #9045Bronze Valve Guides Intake
AFR #9046Bronze Valve Guides Exhaust
AFR #6406AFR BB Chevy 7/16 Exhaust Studs
AFR #6407AFR BB Chevy 7/16 Intake Studs


Specifications, Features, and Optional Supporting Components
75 ft. lbs.Head Torque
GM #12366985Intake Port Gasket
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads.
AFR #6858Exhaust Port Gasket
AFR #6850Head Gasket, 4.540 Bore Fel Pro #1017
AFR #6307Head Studs
AFR #6308Head Bolts
AFR #6320Head Bolt Washers
AFR #6210Stud Girdle
Victor JrSuggested Manifold
RPM PerformerSuggested Manifold
Wieand StealthSuggested Manifold
Autolite 3935Spark Plug Starting Range
As Cast 107cc, CNC 112ccCombustion Chambers
Can be cut to 1.750, no deeperSpring Pocket
StandardValve Spacing
StandardRocker Arms
24°/4° Intake, 15°/4° ExhaustValve Angle
.009” per ccAngle Mill (milling options available), 97cc Maximum
.006” per ccFlat Mill (milling options available), 102cc Maximum

Note: Milling head deck will affect flow numbers. Angle mills might require a .120 thick intake gasket.

Add to Cart:

  • Model: 3640
  • Shipping Weight: 95lbs