Afr 315cc Bullitt Big Block Ford Cylinder Heads 75cc, Raised Exhaust, Solid Roller Springs

The 315cc heads are AFR's largest and best flowing BBF heads! They feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings, and high quality components throughout. These heads are best suited for large displacement high RPM Big Block Ford racing engines or radical "Pro Street" style builds. 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.
AFR's 315cc 14 degree aluminum cylinder heads have 2.300" 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 142cc exhaust ports (raised .250"), AFR's new 300cc is the ultimate choice for large displacement racing engines operating at high RPM. AFR's trademark 3/4" thick cylinder head deck makes them ideal for heavy nitrous or blower applications. These heads have the 1.550" OD Hydraulic Roller Valve Springs, .725" maximum lift for high RPM's.

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 # 100% CNC Ported Combustion Chambers
100% CNC Bowl Blend Intake & Exhaust, Intake Gasket Match
Competition 5-Angle Valve Job
11/32" Bead Lock Intake Valve 2.300" x 5.250" O.A.L
AFR #7552 11/32" Bead Lock Tulip Exhaust Valve 1.760" x 5.050" O.A.L AFR #7553 PAC Racing #1224 1.625" OD Solid Roller Dual Valve Spring 275 lbs. on seat, .850" maximum lift, Max RPM 7400-7600 Uses #8518 Steel Retainer & #8046 Spring Cup (upgrades available)
AFR #8031
10° Manley Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D AFR #8518
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 #9048
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 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 3.440 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.