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- AFR Big Block Chevy 325cc Rectangle Port Magnum Aluminum Cylinder Heads
AFR - Airflow Research 325cc Rectangle Port 24° Magnum Aluminum Cylinder Heads BB-Chevy
033-2101-1
Items You Need
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, .725'' 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 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 | 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. | |||
Specifications:
AFR's 325cc Rectangle Port Powerhouse! Are you looking for big torque and big horsepower number? AFR's BB-Chevy line of medium volume intake runners will provide you with exactly that. The phrase ''having your cake and eating it to'' would certainly be appropriate with their moderately sized intake runners producing tremendous flow figures across the entire lift range. These high flow/high velocity ports provide extreme versatility and fill the needs of many applications. From a max-effort high compression 454-605ci low rpm marine application, either one of these cylinder heads would be a great choice. These heads would also be ideal in a larger cubic inch ''Pro-Street'' application with their broad torque range, as well as significant rpm and horsepower capability. These heads will work best with a primary operating range of 3000-7000 rpm's (This range is an average and will vary with engine displacement as well as component selection). The 325cc comes standard with AFR's trademark .750'' (3/4'') thick head deck, reinforced rocker stud bosses, and are equipped with premium one-piece stainless steel 2.300'' intake valves and 1.880'' exhaust valves. Properly selecting the correct cylinder head for an application depends on a large number of variables. Take note the higher flowing exhaust ports and bolt pattern are raised .375'' (3/8'') over stock location, this rarely affects header or chassis fitment. . Installation Notes: Optional stud girdle required for 2° rolled valve angles and 1'' longer head bolt needed on four bottom exhaust bolt holes. Longer pushrods may also be required.
Motor Vehicles
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Tools:
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Electrical Cords
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