AFR 315cc Fully CNC Ported Magnum BBC Cylinder Head
AFR’s Torque Monster
The
smallest intake volume runners in our line-up, but don’t let
size fool you. Our 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 aluminum cylinder head for an application
depends on a large number of variables. Please consult with one
of our sales technicians to help assist you in making the best decision
for your particular application. (see footnotes here)
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.
315cc BBC CNC Aluminum Cylinder Head Flow Chart
Basic Package Components Competition 5-angle valve job 100% CNC Ported Chambers, Exhaust, and Intake
AFR #7620
Intake Valve, 2.250" stainless steel
AFR #7630
Exhaust Valve, 1.880" stainless steel
AFR #8031
1.625 O.D. Roller Dual Valve Spring with dampener 255 lbs. on seat, .750" maximum lift
Specifications, Features, and Optional Supporting Components
75 ft. lbs.
Head Torque
AFR #6855
Intake Port Gasket, 1.720" x 2.450" with 1/2" radius, Fel-Pro #1211
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads.
AFR #6850
Head Gasket 4.540 bore Fel-Pro #1017
Mark V-VI-up to 4.500 Bore Fel-Pro #17048 or #1047
Head Gasket
Mark V-VI-4.500 to 4.600 Bore Fel-Pro #17049
Head Gasket
AFR #5500
Suggested Manifold, Edelbrock #2907
Edelbrock #2927
Suggested Manifold
Dart #6200, #6201, & #6203
Suggested Manifold
Brodix HVH #2000, #2001, #2005, & #2006
Suggested Manifold
Champion C59C Autolite 3932
Spark Plug Starting Range
121cc
Combustion Chambers
Can be cut to 1.750, no deeper
Spring Pocket
Standard
Valve Spacing
Standard
Rocker Arms
24°/4° Intake, 15°/4° Exhaust
Valve Angle
.009" per cc
Angle Mill (milling options available), 104 cc Maximum
.006" per cc
Flat Mill (milling options available), 114cc Maximum
Note: Milling head deck will affect flow numbers. Angle mills might require a .120 thick intake gasket. |
