AFR's 315cc heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for aggressive street, or street/strip 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.
AFR's Torque Monster!
The smallest intake volume runners in AFR's BBC rectangle port
line-up, but don't let size fool you. AFR's fully CNC ported 315cc
aluminum cylinder heads will provide you with flow numbers most
medium sized heads, and some larger, can only dream about. This
line was designed to optimize low and mid-lift airflow, while
still generating impressive peak figures. Their application should
be focused on smaller cubic inch Big Blocks (396-502), with a
primary operating range of 2500-6800 rpm’s (this range is an
average and will vary with engine displacement as well as
component selection). These heads should also be given strong
consideration in larger street driven or marine applications up to
555 CID, where low rpm power and drivability are a factor. The 315
version is extremely versatile with its incredibly strong low and
midlift airflow figures as well as peak numbers approaching the
400 CFM mark. These heads would be a great choice if your looking
for big torque, strong low rpm performance, and still have good
rpm capabilities. The 315cc come standard with AFR's trademark
.750" thick head deck, reinforced rocker stud bosses, and are
equipped with premium one piece stainless steel 2.250" intake
valves and 1.880" exhaust valves. Standard combustion chamber
volume is 121cc for our BBC 315cc. Properly selecting the correct
cylinder head for an application depends on a large number of
variables. Please consult with one of our sales technicians to
assist you in making the best decision for your particular
application.
Note:
Optional stud girdle required for 2° rolled valve angles and 1"
longer head bolts needed on four bottom exhaust bolt holes. Longer
pushrods might also be required.
color="#ffffff" size="4">Basic Package Components |
color="#ffffff" size="4">Part # |
100%
CNC Ported Chambers, Exhaust and Intake
Competition 5-angle Valve Job |
|
11/32" Intake Valve,
2.250" x 5.500" O.A.L |
AFR #7620 |
11/32"
Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve
Length |
AFR #7630 |
Manley 10° Steel
Retainers 1.500" O.D x 1.168" I.D x .844" I.D |
AFR #8518
|
PAC Racing Spring #1224
1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum
Lift, Max RPM 7400-7600 |
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 |
Hardened
Spring
Cup 1.740" O.D / 1.650" I.D |
AFR #8046 |
Intake Valve Seats
2.450" O.D x 2.000" I.D x .375" Deep |
AFR #9062 |
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 |
color="#ffffff" size="4">Specifications, Features, and
Optional Supporting Components |
Head Torque |
75 ft.
lbs |
Intake Port Gasket |
AFR
#6853 (.120" Thick) or style="float:right;">AFR #6855 (.060" Thick) |
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
|
Super
Victor Victor Jr.,
|
Spark Plug
Starting Range |
style="float: right;">Autolite 3932 |
Combustion Chambers |
121cc w/ CNC Chambers or 117cc w/ As Cast
Chambers |
Valve
Spring Pocket Diameter |
style="float: right;">1.725 O.D
|
Intake Port Dimension |
2.450"H
x 1.755"W x 13/32 Radius |
Exhaust
Port Dimension |
style="float:right;">1.780"H x 2.025" W |
Valve Angle |
24°/4°
Intake,
15°/4° Exhaust |
Angle Mill
|
style="float:right;">.009" per cc/ Maximum 104cc as
cast or CNC Chamber |
Flat Mill
|
.006"
per
cc/ Maximum 108cc as cast or 114cc CNC Chamber |
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. color="#000000" face="Arial">1" longer head bolts needed on
four bottom exhaust bolt holes. Angle mills might require a
.120 thick intake gasket.
