AFR - Airflow Research 357cc Rectangle Port 24° Magnum Aluminum Cylinder Heads Big Block Chevy
033-3570
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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 357cc 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 - 2.300'' (Valve not included) | |
| Exhaust Valve Size - 1.880'' (Valve not included) | |
| Intake Valve Seats | |
| Exhaust Valve Seats | |
| Bronze Valve Guides | |
| Big Block Chevy 357cc 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 | 357cc 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:
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