Product Description
AFR – Airflow Research 3250-1 – AFR Big Block Chevy 325cc Rectangle Port Magnum Aluminum Cylinder Heads Details
100% CNC Combustion Chamber Package
Big Block Chevy 325cc Rectangle Port 24° Magnum Basic Package Components
| 100% CNC Ported Combustion Chambers | ||
| Bowl Blended Exhaust Ports | ||
| Bowl Blended 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 325cc 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 Pro 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 | 121cc Fully CNC’d | |
| Intake Port Volume | 325cc 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. | |
