AFR 315cc Fully CNC'd
The smallest intake volume runners in our line-up, but don’t let size fool you. Our 305cc “As Cast” or fully CNC ported 315cc 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. Either one of these two cylinder heads would be a great choice if your looking for big torque, strong low rpm performance, and still have good rpm capabilities. Both the 305cc and 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 119 cc’s on the 305 “As Cast” pieces, while our fully CNC ported 315cc version comes with a 121cc chamber. Both are available with an optional 114cc combustion chamber as well.
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 help 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.
Basic Package Components
Competition 5-angle Valve Job
Intake Valve, 2.300” stainless steel, AFR #7626
Exhaust Valve, 1.880” stainless steel, AFR #7631
1.550” OD Roller Dual Valve Spring with dampner, 240 lbs. on seat, .750” maximum lift, AFR #8003
10º Chrome Moly Retainers, AFR #8510
10º Chrome Moly Valve Locks, AFR #9005
Valve Seals, AFR #6611
Hardened Shims, AFR #8044
Intake Valve Seats, AFR #9062
Exhaust Valve Seats, AFR #9064
Bronze Valve Guides Intake, AFR #9045
Bronze Valve Guides Exhaust, AFR #9046
Guide Plates, AFR #6109
7/16" Exhaust Rocker Stud AFR #6406
7/16" Intake Rocker Stud AFR #6407
All Accessory Holes are Predrilled & Tapped!
Specifications, Features, and Supporting Components
Head Torque 75 Ft. Lbs.
Intake Port Gasket, 1.775” x 2.500” with 1/2” radius AFR #6856
Exhaust Port Gasket AFR #6858
Head Gasket 4.370 bore, Fel Pro #1027, AFR #6851
4.540 bore, Fel Pro #1017, AFR #6850
Mark V-VI-up to 4.500 Bore Fel-Pro #17048 or #1047
Mark V-VI-4.500 to 4.600 Bore Fel-Pro #17049
Head Bolts & Studs Standard ARP, AFR #6308 & #6307
Head Bolt Washers Manley, AFR #6320
Stud Girdle AFR #6210
Sugg.. Manifold Edelbrock #2907 & #2927, AFR #5500 & #5502
Dart #6200, #6201, #6202 & #6203
Brodix HVH #2000, #2001, #2005 & #2006
Spark Plug Starting Range Champion C59C Autolite 3932
Combustion Chambers 119cc
Spring Pocket can be cut to 1.750, no deeper.
Valve Spacing Standard
Valve Angle 24º/4º Intake, 15º/4º Exhaust
Angle Mill (milling available), 102cc Maximum .009” per cc
Flat Mill (milling available), 114cc Maximum .006” per cc
Note: Milling head deck will affect flow numbers.
This product was added to our catalog on Saturday 08 January, 2005.