AFR 315 CNC BBC Aluminum Cylinder Head

Sale: $3,481.40
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AFR 315cc Fully CNC Ported Magnum BBC Cylinder Head

AFR’s Torque Monster


BBC 315cc Fully CNC ported Magnum Cylinder Heads
Click to enlarge

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)


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

315cc BBC Cylinder Head Flow Chart


Basic Package Components
Competition 5-angle valve job
100% CNC Ported Chambers, Exhaust, and Intake
AFR #7620Intake Valve, 2.250" stainless steel
AFR #7630Exhaust Valve, 1.880" stainless steel
AFR #80311.625 O.D. Solid Roller PAC Racing Spring #1224, 275lbs on seat, .850 Maximum Lift
AFR #851810° Chrome Moly Retainer
AFR #900510° Valve Locks
AFR #6109Guide Plates
AFR #6611Viton Valve Seals
AFR #8046Hardened Spring Cup
AFR #9062Intake Valve Seats
AFR #9064Exhaust Valve Seats
AFR #9045Bronze Valve Guides Intake
AFR #9046Bronze Valve Guides Exhaust
AFR #6406AFR BB Chevy 7/16 Exhaust Studs
AFR #6407AFR BB Chevy 7/16 Intake Studs


Specifications, Features, and Optional Supporting Components
75 ft. lbs.Head Torque
AFR #6855Intake Port Gasket, 1.720" x 2.450" with 1/2" radius or Fel-Pro #1275
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads.
AFR #6858Exhaust Port Gasket
AFR #6850Head Gasket 4.540 bore Fel-Pro #1017
Mark V-VI-up to 4.500 Bore Fel-Pro #17048 or #1047Head Gasket
Mark V-VI-4.500 to 4.600 Bore Fel-Pro #17049Head Gasket
AFR #6306Head Bolts
AFR #6307Head Studs
AFR #6308Head Bolts
AFR #6320Head Bolt Washers
AFR #6210Stud Girdle
AFR #5500Suggested Manifold, Edelbrock #2907
Edelbrock #2927Suggested Manifold
Dart #6200, #6201, & #6203Suggested Manifold
Brodix HVH #2000, #2001, #2005, & #2006Suggested Manifold
Champion C59C Autolite 3932Spark Plug Starting Range
121ccCombustion Chambers
Can be cut to 1.750, no deeperSpring Pocket
StandardValve Spacing
StandardRocker Arms
24°/4° Intake, 15°/4° ExhaustValve Angle
.009" per ccAngle Mill (milling options available), 104 cc Maximum
.006" per ccFlat Mill (milling options available), 114cc Maximum

Note: Milling head deck will affect flow numbers. Angle mills might require a .120 thick intake gasket.

Add to Cart:

  • Model: 2000
  • Shipping Weight: 94lbs