Description
AFR – Airflow Research 3050 – AFR Big Block Chevy 305cc Rectangle Port Magnum Aluminum Cylinder Heads Details
50% CNC Combustion Chamber (Bowl Blend) Package
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 305cc Rectangle Port 24° Magnum Basic Package Components
| 50% CNC Ported Combustion Chambers | ||
| Bowl Blended Exhaust Ports | ||
| Bowl Blended Intake Ports | ||
| Competition 5-Angle Valve Job | ||
| Intake Valve Size – 2.250” (Valve not included) | ||
| Exhaust Valve Size – 1.880” (Valve not included) | ||
| Intake Valve Seats | ||
| Exhaust Valve Seats | ||
| Bronze Valve Guides | ||
| Big Block Chevy 305cc Rectangle Port 24° Magnum Head Specifications | ||
| Head Torque w/Moly Lube | 75 Ft. Lbs. | |
| Rocker Stud Torque | 55 Ft. Lbs. | |
| Intake Port Gasket, 1.720” x 2.450” with 1/2” radius | Fel-Pro 1275 – DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket. | |
| Exhaust Port Gasket | AFR 6858 | |
| Head Gasket Mark IV | 4.540” Bore, Fel Pro 1017 AFR 6850 |
|
| Head Gasket Mark V – VI | Up to 4.500” Bore, Fel Pro17048 or 1047 | |
| Head Gasket Mark V – VI | 4.500” to 4.600” Bore, Fel Pro 17049 | |
| Head Bolts & Studs | Standard ARP | |
| Head Bolt Washers | Manley Standard | |
| Stud Girdle | AFR 6210 | |
| Suggested Manifold | Edelbrock 2907 & 2927 or Brodix HV2000 & HV2001 | |
| Spark Plug Starting Range | Champion C59C, Autolite 3932 | |
| Combustion Chambers | 117cc Partially CNC Bowl Blend | |
| Intake Port Volume | 305cc Partially 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. | |
