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AFR - Airflow Research 2101-1

325cc Rectangle Port 24° Magnum Aluminum Cylinder Heads BB-Chevy

AFR - Airflow Research 2101-1

033-2101-1

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Estimated ship date 12/13/17 if Ordered Today
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AFR - Airflow Research 2101-1 325cc Rectangle Port 24° Magnum Aluminum Cylinder Heads BB-Chevy $2,703.39
325cc Rectangle Port 24° Magnum Aluminum Cylinder Heads
  • BB-Chevy
  • 121cc Combustion Chambers
  • 1.625'' Valve Spring
  • 275 lbs. Seat Pressure
  • .725'' Max Lift
  • 100% CNC Combustion Chambers
  • Assembled
  • Sold in Pairs, 2/pkg.

  • AFR - Airflow Research 2101-1 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, .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 SpecificationsHead Torque w/Moly Lube75 Ft. Lbs.Rocker Stud Torque55 Ft. Lbs.Intake Port Gasket, 1.720'' x 2.450'' with 1/2'' radiusFel-Pro 375-1275 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.Exhaust Port GasketAFR 033-6858Head Gasket Mark IV4.540'' Bore, Fel Pro 375-1017
    AFR 033-6850
    Head Gasket Mark V - VIUp to 4.500'' Bore, Fel Pro 375-1047Head Gasket Mark V - VI4.500'' to 4.600'' Bore, Fel Pro 375-17049Head Bolts & StudsStandard ARPHead Bolt WashersManley StandardStud GirdleAFR 033-6210Suggested ManifoldEdelbrock 350-2907 & 350-2927 or Brodix 158-HV2000 & 158-HV2001Spark Plug Starting RangeChampion C59C, Autolite 3932Combustion Chambers121cc Fully CNC'dIntake Port Volume325cc Partially PortedExhaust Port VolumeN/ASpring Pocket can be cut to 1.750, no deeper.Valve SpacingStandardRocker ArmsStandardValve Angle24° / 4° Intake ; 15° / 4° ExhaustAngle Mill, 104cc Maximum.009'' per ccFlat Mill, As Cast 108cc, CNC 114cc Maximum.006'' per ccNOTE:Flat and Angle mills might require a .120'' thick head gasket.

    Specifications:

    Quantity
    Sold as a pair
    Cylinder Head Style
    Assembled
    Guideplates Included
    Yes
    Rocker Arm Studs Included
    Yes
    Accessory Bolt Holes Drilled
    Yes
    Cylinder Head Finish
    Natural
    Cylinder Head Material
    Aluminum
    CNC-Machined Combustion Chamber
    Yes
    CNC-Machined Exhaust Runner
    Yes
    CNC-Machined Intake Runner
    Yes
    Damper Spring Included
    Yes
    Exhaust Valves Included
    Yes
    Heat Crossover
    No
    Intake Valves Included
    Yes
    Locks Included
    Yes
    Machined for O-Ring
    No
    Retainers Included
    Yes
    Rocker Arm Nuts Included
    No
    Rocker Arms Included
    No
    Steam Holes Drilled
    No
    Valve Guides Included
    Yes
    Valve Seats Machined
    Yes
    Valve Springs Included
    Yes
    Valve Stem Seals Included
    Yes
    Combustion Chamber Volume (cc)
    121
    Intake Port Location
    Standard
    Exhaust Port Location
    Standard
    Oiling Style
    Through pushrod
    Intake Valve Diameter (in.)
    2.3
    Exhaust Valve Diameter (in.)
    1.88
    Valve Guide Material
    Bronze
    Intake Runner Volume (cc)
    325
    Valve Seat Material
    Ductile iron
    Valve Cover Mounting Style
    Perimeter bolt
    Intake Valve Angle
    24/4
    Valve Seat Machine Style
    5-angle
    Exhaust Runner Volume (cc)
    124
    Outside Diameter of Outer Spring (in.)
    1.625
    Number of Springs Per Valve
    Dual
    Retainer Material
    Chromoly steel
    Lock Style
    10 degree
    Exhaust Valve Angle
    15/4
    Combustion Chamber Style
    Heart
    Rocker Arm Nut Thread Size (in.)
    7/16"-20
    Manufacturer's Part Number:
    2101-1

    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.

    325cc Rectangle Port Magnum Cylinder Head Features:
  • 50% Partially or 100% Fully CNC Ported Combustion Chambers
  • Bowl Blended Exhaust Ports
  • Bowl Blended Intake Ports
  • Competition 5-angle Valve Job
  • 325cc Intake Ports
  • Intake Valve, 2.300'' x 5.500'' Overall Valve Length
  • Exhaust Valve, 1.880'' x 5.442'' Overall Valve Length
  • 1.625'' OD PAC Racing Solid Roller Valve Spring, 275 lbs on seat, .850'' maximum lift
  • 10° Manley 4140 Chrome Moly Retainers
  • 10° Valve Locks
  • 7/16'' Rocker Studs
  • Adjustable 3/8'' Guide Plates
  • Viton Valve Seals
  • Hardened Spring Seats
  • Intake Valve Seats
  • Exhaust Valve Seats
  • Bronze Valve Guides

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