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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 12/12/17 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

    Years of research and development have been invested to bring you the ultimate in bolt on performance for your Big Block Chevrolet. Airflow Research is proud to introduce our BB Chevy Aluminum cylinder heads. AFR's highly efficient port designs outflow the competition at every lift-point, even those with considerably larger runner volumes. An exclusive new combustion chamber design provides impressive swirl figures and help these heads generate big low and mid-lift airflow numbers. Considerable time has been spent to bring you a cylinder head which maximizes the entire flow curve, not just the big peak numbers. This aids in a much better ''cylinder fill'' and dramatically increases engine ''average'' airflow consumption (also spelled Horsepower!) The high velocity port designs help enhance engine acceleration as well as torque output. Structural features like our trademark 3/4'' head deck (a must for blown or nitrous engines), reinforced rocker stud bosses, and thick wall runners provide unparalleled durability, helping to create the strongest Big Block Chevy castings available today. Both intake and exhaust valve angles have been rolled two degrees to improve flow characteristics and provide a more efficient burn in the combustion chamber. The Unmatched Magnum version features combustion chambers with intake ports available at 305, 315, 325, 335, 345 and 357cc's. ''As Cast'' leaves the ports untouched or non-machined, so you can machine/tune your head the way that best fits your set up.

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