AFR 280cc Bullitt Big Block Ford Cylinder Heads 85cc, Solid Roller Springs

AFR`s 280cc "As Cast" 14 degree heads are the cost effective performance choice over re-worked factory heads. They feature partially CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout with standard exhaust port locations. Recommended for street, towing, or street/strip engines with displacements up to 477 cubic inches, operating up to 6500-6700 RPM. Component upgrades and machining options are available to customize AFR Heads to your specific build.

Due to AFR's revised valve location and angle, application specific AFR pistons or fly cutting your current pistons will be required.






The Most Cost Effective Street/Strip Head Available

AFR's 280cc aluminum cylinder heads have 2.250" intake valves and
1.760" exhaust valves that move tremendous volumes of air through
conservative runner volumes, spelling big torque and horsepower
numbers. With combustion chamber volumes of 85cc (Milling from
75-83cc possible for $250) accompanied by 132cc exhaust ports, AFR's
new 280cc is the ultimate choice for up to 477 cubic inch engines
operating up to 6200 RPM. AFR's trademark 3/4" thick cylinder head
deck makes them ideal for heavy nitrous or blower applications.



Notes:

Due to AFR's revised valve location and angle, application specific
AFR pistons or fly cutting your current pistons will be required.

color="#ffffff" size="4">Basic Package Components	color="#ffffff" size="4">Part #
50% CNC Ported Combustion Chambers 80% CNC Bowl Blend Intake & Exhaust, Intake Gasket Match Competition 5-Angle Valve Job
11/32" Bead Lock Intake Valve 2.250" x 5.250" O.A.L	AFR #7551
11/32" Bead Lock Tulip Exhaust Valve 1.760" x 5.050" O.A.L	AFR #7553
PAC Racing Springs 1.550" OD Solid Roller Dual Valve Drag Race Spring 220 lbs. on seat, .680" maximum lift Max RPM 7200-7400 (upgrades available)	AFR #8000
10° Manley Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D	AFR #8511
10° 11/32" Beadlock Valve Keepers with lashcap recess	AFR #9010
7/16" Rocker Studs Intake	AFR #6407
Adjustable 3/8" Guide Plates	AFR #6108
11/32" Viton Valve Seals	AFR #6610
Hardened Valve 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
Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D	AFR #9066
11/32" Bronze Valve Guides .502" O.D x 2.250" O.A.L	AFR #9046

color="#ffffff" size="4">Specifications, Features, and Optional Supporting Components

Intake Port Gasket	AFR #6893
Exhaust Port Gasket, Fel-Pro #1420	AFR #6891
Head Gasket, 4.500 Bore, Fel-Pro #1018	AFR #6892
Head Bolts, ARP #155-3603	AFR #6340
Head Studs, ARP# 155-4202 12 Point	AFR #6341
Head Bolt Washers, Manley	AFR #6320
Stud Girdle	AFR #6209
Suggested Manifold	AFR Single Plane, AFR# 4992 or 4993
Spark Plug Starting Range	Autolite 3932
Combustion Chambers	85cc (Milling from 76-83cc possible for $250)
Spring Pocket	1.750" O.D
Valve Angle	14° Intake/8° Exhaust
Minimum Bore Diameter	4.360"
Minimum Cross Sectional Area	3.225 sq. in.

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.