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

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.

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 Components	Part #
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.L	AFR #7626
11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length	AFR #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 recess	AFR #9005
ARP 7/16" Rocker Exhaust Studs	AFR #6406
ARP 7/16" Rocker Intake Studs	AFR #6407
Adjustable 3/8" Guide Plates	AFR #6109
11/32" Viton Valve Seals	AFR #6611
Spring I.D Locator 1.550" O.D x .780" I.D	AFR #8048
Intake Valve Seats 2.450" O.D x 1.950" I.D x .375" Deep	AFR #9065
Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep	AFR #9064
11/32" Intake Bronze Valve Guides .531" O.D x 2.10" O.A.L	AFR #9045
11/32" Exhaust Bronze Valve Guides .531" O.D x 2.25" O.A.L	AFR #9046

Specifications, Features, and Optional Supporting Components

Head Torque	75 ft. lbs
Intake Port Gasket	Mr. Gasket #107 or GM #12366985
Exhaust Port Gasket	AFR #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 235-4713	AFR #6307
Head Bolt Washers, Manley	AFR #6320
Suggested Manifold	RPM PerformerVictor Jr.,
Spark Plug Starting Range	Autolite 3932
Combustion Chambers	112cc with CNC Chambers
Valve Spring Pocket Diameter	1.725 O.D
Intake Port Dimension	2.055"H x 1.840"W x1/2 Radius
Exhaust Port Dimension	1.770"H x 2.010" W
Valve Angle	24°/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.