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.

Basic Package Components	Part #
100% CNC Ported Exhaust Ports 100% CNC Ported Intake Ports 100% CNC Ported Combustion Chambers 5-angle valve job
Intake Valve, 2.250" stainless steel	AFR #7620
Exhaust Valve, 1.880" stainless steel	AFR #7630
1.625 O.D. Solid Roller PAC Racing Spring, 275lbs on seat, .850 Maximum Lift	AFR #8031
10° Chrome Moly Retainer	AFR #8518
10° Valve Locks	AFR #9005
Guide Plates	AFR #6109
Viton Valve Seals	AFR #6611
Hardened Spring Cup	AFR #8046
Intake Valve Seats	AFR #9062
Exhaust Valve Seats	AFR #9064
AFR BB Chevy 7/16 Exhaust Studs	AFR #6406
AFR BB Chevy 7/16 Intake Studs	AFR #6407

Specifications, Features, and Optional Supporting Components

Head Torque	75 ft. lbs
Intake Port Gasket, 1.720" x 2.450" with 1/2" radius, Fel-Pro #1211	AFR #6855
Exhaust Port Gasket	AFR #6858
Head Gasket	AFR #6850
Head Studs	AFR #6307
Head Bolts	AFR #6308
Head Bolt Washers	AFR #6320
Stud Girdle	AFR #6210
Suggested Manifold	Dart #6200, #6201, & #6203
Suggested Manifold	Brodix HVH #2000, #2001, #2005, & #2006
Spark Plug Starting Range	Champion C59C Autolite 3932
Combustion Chambers	121cc
Spring Pocket	Can be cut to 1.750, no deeper
Valve Spacing	Standard
Rocker Arms	Standard
Valve Angle	24°/4° Intake, 15°/4° Exhaust
Angle Mill (Milling options available) 104cc max	.009" per cc
Flat Mill (Milling options available) 114cc max	.006" per cc

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. Angle mills might require a .120 thick intake gasket.