AFR As Cast 305cc BBC Head

AFR 305cc as cast BBC race heads

AFR’s Torque Monster

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, 1.720” x 2.450” with 1/2” radius AFR #6855

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, #6306, #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

Rocker Arms 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.