Other products by AFR
Item #: 3670
Reg. Price: USD $3,141.00
Our Price: USD $3,133.00
Quantity:
 

Description 

300cc Oval Port 24° "Magnum" BBC

The Ultimate Street/Race Weapon

AFR's 300cc heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for aggressive street, street/strip or race builds with displacements up to 540 cubic inches, operating up to 6800 RPM.

Note:

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

300cc BBC Aluminum Cylinder Head Flow Chart

Tested on 4.310 Bore

300cc BBC Cylinder Head Flow Chart

Included Components
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
100% CNC Ported Combustion Chambers
Competition 5-angle Valve Job
AFR #762611/32" Intake Valve, 2.300" x 5.500" O.A.L
AFR #763011/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length
AFR #80021.550 O.D. Hydraulic Roller Dual Valve Spring 160 lbs. on seat, .680 maximum lift, Max RPM 6500-6700, Uses #8511 Steel Retainer and #8048 Spring Cup
AFR #8031PAC Racing Spring #1224 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600, Uses #8518 Steel Retainer (upgrades available)
AFR #8511 for spring #8002Manley 10° Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D
AFR #8518 for spring #8031Manley 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 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
300ccIntake Port Volume
2.055"H x 1.840"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.
3.020 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

 

Share







Pin It

Email A Friend

Send your friend a link to this product.