AFR - Airflow Research 385cc Rectangle Port 24° Magnum Aluminum Cylinder Heads Big Block Chevy
033-3580
Product Q&A
View Now
This is an unassembled bare cylinder head with valve guides and valve seats installed only. Does not include any parts such as valves, springs, spring components, studs or guideplates.
| Big Block Chevy 385cc Rectangle Port 24° Magnum Basic Package Components | |
| 100% CNC Ported Combustion Chambers | |
| 100% CNC Ported Exhaust Ports | |
| 100% CNC Ported Intake Ports | |
| Competition 5-Angle Valve Job | |
| Intake Valve Size - 2.380'' (Valve not included) | |
| Exhaust Valve Size - 1.880'' (Valve not included) | |
| Intake Valve Seats | |
| Exhaust Valve Seats | |
| Bronze Valve Guides | |
| Big Block Chevy 385cc Rectangle Port 24° Magnum Head Specifications | |
| Head Torque w/Moly Lube | 75 Ft. Lbs. |
| Rocker Stud Torque | 55 Ft. Lbs. |
| Intake Port Gasket, 1.775'' x 2.500'' with 1/2'' radius | Fel-Pro 375-1275 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket. |
| Exhaust Port Gasket | AFR 033-6858 |
| Head Gasket Mark IV | 4.540'' Bore, Fel Pro 375-1017 AFR 033-6850 |
| Head Gasket Mark V - VI | Up to 4.500'' Bore, Fel Pro 375-1047 |
| Head Gasket Mark V - VI | 4.500'' to 4.600'' Bore, Fel Pro 375-17049 |
| Head Bolts & Studs | Standard ARP |
| Head Bolt Washers | Manley Standard |
| Stud Girdle | AFR 033-6210 |
| Suggested Manifold | Edelbrock 350-2907 & 350-2927 or Brodix 158-HV2000 & 158-HV2001 |
| Spark Plug Starting Range | Champion C59C, Autolite 3932 |
| Combustion Chambers | 121cc Fully CNC'd |
| Intake Port Volume | 385cc Fully Ported |
| Exhaust Port Volume | N/A |
| 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, 104cc Maximum | .009'' per cc |
| Flat Mill, As Cast 108cc, CNC 114cc Maximum | .006'' per cc |
| NOTE: | Flat and Angle mills might require a .120'' thick head gasket. |
Specifications:
![Pro1 CNC LS3 Aluminum Cylinder Head [Bare]](https://www.jegs.com/images/photos/300/301/301-11030050.jpg){kind=small}
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.