AFR 325cc Rectangle Port "Magnum" BBC 24°
AFR's 325cc heads are designed feature partially CNC ported intake, exhaust and chambers, A356 aluminum castings and high quality components throughout. Recommended for more aggressive street, or street/strip builds with displacements up to 540 cubic inches, operating up to 6800 RPM. Also available with 100% CNC chambers for increased air flow (see chart).
Note:
1" longer head bolts needed on four bottom exhaust bolt holes.
AFR 325cc as cast BBC Aluminum Cylinder Head Flow Chart
Included Components
Competition 5-angle valve job
50% CNC Ported Combustion Chambers
20% CNC Ported Exhaust Ports
30% CNC Ported Intake Ports
AFR #762611/32" Intake Valve, 2.300" x5.500" O.A.L
AFR #763111/32" Tulip Exhaust Valve, 1.880" x 5.450" O.A.L
AFR #8031PAC Racing Spring #1224 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600
AFR #8518Manley 10° Steel Retainers 1.500" O.D x 1.168" I.D x .844" 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 #8046Hardened Spring Cup 1.740" O.D / 1.650" I.D
AFR #9062Intake Valve Seats 2.450" O.D x 2.000" 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
325ccIntake Port Volume
2.360"H x 1.685"W x 3/8 RadiusIntake Port Dimension
StockIntake Port Location
132ccExhaust Port Volume
1.720"H x 1.920" WExhaust Port Dimension
.375" RaisedExhaust Port Location
117ccCombustion Chamber Size(As Cast)
121ccCombustion 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 108cc As Cast or 114cc CNC ChamberFlat Mill
.009" per cc/Maximum 104cc As Cast or CNC ChamberAngle Mill
Note:Angle mills might require a .120" Thick intake gasket.
3.111 sq. in. Minimum Cross Sectional Area
14mm x .750" w/Gasket SeatSpark Plug Dimensions
Recommended Components:
AFR #6853 (.120" Thick)Intake Port Gasket
AFR #6855 (.060" Thick)Intake 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
Super VictorSuggested Manifold
Autolite 3932Spark Plug Starting Range