Description
AFR – Airflow Research 2101-1 – 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, 2.300” x 5.500” Overall Length | ||
Exhaust Valve, 1.880” x 5.442” Overall Length | ||
1.625” OD PAC Racing Solid Roller Valve Spring, 275 lbs. on seat, .850” maximum lift, max RPM 7400-7600 | ||
10º Manley 4140 Chrome Moly Retainers | ||
10º Valve Locks | ||
7/16” Rocker Studs | ||
Adjustable 3/8” Guide Plates | ||
Viton Valve Seals | ||
Hardened Spring Seat | ||
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 |
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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. |