Other products by AFR
Item #: 3630
Reg. Price: USD $2,699.00
Our Price: USD $2,691.00


290cc Oval Port 24° "Magnum" BBC

Our Medium Sized Oval Port

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.


1" longer head bolts needed on four bottom exhaust bolt holes.

290cc BBC Aluminum Cylinder Head Flow Chart

Tested on 4.310 Bore

290cc BBC Cylinder Head Flow Chart

Included Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
AFR #762011/32" Intake Valve, 2.250" x 5.500" O.A.L
AFR #763011/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length
AFR #8002PAC Racing Springs#1940 1.550" O.D. Hydraulic Roller Dual Valve Spring, 175 lbs. on seat, .725" maximum lift, 473lbs @ .600 lift, Max RPM 6500-6700
AFR #8000PAC Racing Spring 1.550 O.D. Solid Roller Valve Spring, 220lbs on seat, .710" Maximum Lift, Max RPM 7200-7400 (upgrades available)
AFR #8511Manley 10° Steel Retainers 1.500" O.D x 1.120"I.D x .705" I.D
AFR #900510° 11/32" Valve Locks with lashcap recess
AFR #6406ARP 7/16" Rocker Exhaust Studs
AFR #6407ARP 7/16" Rocker Intake Studs
AFR #6109Adjustable 3/8" Guide Plates
AFR #661111/32" Viton Valve Seals
AFR #8048Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D
AFR #9065Intake Valve Seats 2.450" O.D x 1.950" I.D x .375" Deep
AFR #9064Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep
AFR #904511/32" Intake Bronze Valve Guides .531" O.D x 2.10" O.A.L
AFR #904611/32" Exhaust Bronze Valve Guides .531" O.D x 2.25" O.A.L

Specifications & Features:

A356 AluminumMaterial
290ccIntake Port Volume
2.030"H x 1.830"W x1/2 RadiusIntake Port Dimension
StockIntake Port Location
135ccExhaust Port Volume
1.770"H x 2.010" WExhaust Port Dimension
.375" RaisedExhaust Port Location
112ccCombustion Chamber Size(Full CNC)
Perimeter BoltValve Cover Bolt Pattern
24°/4° Int, 15°/4° ExhValve Angle
1.725" O.DValve Spring Pocket Diameter
1.750" O.DMax Valve Spring Pocket Machining
.750"Deck Thickness
4.250"Minimum Bore Diameter
.006" per cc/ Maximum 102ccFlat Mill
.009" per cc/ Maximum 97ccAngle Mill
Note:Angle mills might require a .120" Thick intake gasket.
2.895 sq. in. Minimum Cross Sectional Area
14mm x .750" w/Gasket SeatSpark Plug Dimensions

Recommended Components:
Mr. Gasket #107 or 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 #6849Head Gasket, Fel-Pro #1047 (Mark V and VI)
AFR #6850Head Gasket,, Fel-Pro #1017-1 (Mark IV)
AFR #6306Head Bolts, ARP 135-3703 (Mark IV)
AFR #6308Head Bolts, ARP 135-3707 (Mark V)
AFR #6307Head Studs, ARP 235-4713
AFR #6320Head Bolt Washers, Manley
AFR #6202Stud Girdle, (AFR Specific)
Victor JrSuggested Manifold
RPM PerformerSuggested Manifold
Autolite 3932Spark Plug Starting Range



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