Afr 280cc Bullitt Big Block Ford Cylinder Heads 75cc, Solid Roller Springs

Our 280cc 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 6200 RPM. Please note, due to AFR's valve angle and location, custom pistons or notching existing 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 75cc 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.

Basic Package Components 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
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 75cc
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.