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AFR 300cc BBC Oval Port Cylinder Heads, CNC Ported, Solid Roller Springs

AFR 3680
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. Component upgrades and machining options are available to customize AFR Heads to your specific build.
Shipping: FREE continental USA ground shipping on ALL AFR Cylinder Heads
Was: $4,175.75
Sale: $3,875.75
Save: 7%
Save: $300.00

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Description

The Ultimate Street Weapon!
For the ultimate in "Oval Port" performance with solid roller springs, the fully CNC ported AFR 300 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.

Basic Package ComponentsPart #
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
100% CNC Ported Combustion Chambers
Competition 5-angle Valve Job

11/32" Intake Valve, 2.300" x 5.500" O.A.LAFR #7626
11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve LengthAFR #7630
PAC 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 #8031
10° 11/32" Valve Locks with lashcap recessAFR #9005
ARP 7/16" Rocker Exhaust StudsAFR #6406
ARP 7/16" Rocker Intake StudsAFR #6407
Adjustable 3/8" Guide PlatesAFR #6109
11/32" Viton Valve SealsAFR #6611
Spring I.D Locator 1.550" O.D x .780" I.DAFR #8048
Intake Valve Seats 2.450" O.D x 1.950" I.D x .375" DeepAFR #9065
Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" DeepAFR #9064
11/32" Intake Bronze Valve Guides .531" O.D x 2.10" O.A.LAFR #9045
11/32" Exhaust Bronze Valve Guides .531" O.D x 2.25" O.A.LAFR #9046

Specifications, Features, and Optional Supporting Components
Head Torque75 ft. lbs
Intake Port GasketMr. Gasket #107 or GM #12366985
Exhaust Port GasketAFR #6858
Head Gasket, Fel-Pro #1047 (Mark V and VI)AFR #6849
Head Gasket, Fel-Pro #1017-1 (Mark IV)AFR #6350
Head Bolts, ARP 135-3703 (Mark IV)AFR #6306
Head Bolts, ARP 135-3707 (Mark V)AFR #6308
Head Studs, ARP 235-4713AFR #6307
Head Bolt Washers, ManleyAFR #6320
Suggested Manifold
RPM PerformerVictor Jr., 
Spark Plug Starting RangeAutolite 3932
Combustion Chambers112cc with CNC Chambers
Valve Spring Pocket Diameter1.725 O.D
Intake Port Dimension2.055"H x 1.840"W x1/2 Radius
Exhaust Port Dimension1.770"H x 2.010" W
Valve Angle24°/4° Intake, 15°/4° Exhaust
Angle Mill (Milling options available) 97cc max
.009" per cc
Flat Mill (Milling options available) 102cc max
.006" per cc
Stud Girdle, (AFR Specific)AFR #6202
Important: Do not port match you intake manifold to any Fel-Pro gasket as it does not precisely match AFR heads.
Note: Milling head deck will affect flow numbers.
1" longer head bolts needed on four bottom exhaust bolt holes. Angle mills might require a .120 thick intake gasket.

Details

Shipping Information

  • Item Requires Shipping
  • 80.0 lbs.
  • W24.0000” x H12.0000” x L24.0000”
  • Free Basic Shipping
  • This item ships in its own box.
  • FREE continental USA ground shipping on ALL AFR Cylinder Heads

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