Afr 300cc Bbc Oval Port Cylinder Heads, Cnc Ported, Hydraulic 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 hydraulic 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 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 #8002 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 Performer Victor 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.