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AFR - Airflow Research 211080368508

345cc Rectangle Port 24° Magnum Aluminum Cylinder Heads BB-Chevy

AFR - Airflow Research 211080368508


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Estimated to ship directly from the manufacturer on 05/02/18
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AFR - Airflow Research 211080368508 345cc Rectangle Port 24° Magnum Aluminum Cylinder Heads BB-Chevy $2,934.99
345cc Rectangle Port 24° Magnum Aluminum Cylinder Heads
  • BB-Chevy
  • 117cc Combustion Chambers
  • 1.640'' Valve Spring
  • 250 lbs. Seat Pressure
  • .800'' Max Lift
  • 50% CNC Combustion Chambers
  • Assembled
  • Sold in Pairs, 2/pkg.

  • AFR - Airflow Research 211080368508 Details

    50% CNC Combustion Chamber (Bowl Blend) Package

    BB Chevy Basic Package Components
    Competition 5-angle Valve Job
    Intake Valve, 2.250'' stainless steel
    Exhaust Valve, 1.880'' stainless steel
    1.625'' OD Roller Dual Valve Spring with dampner, 240 lbs. on seat, .750'' maximum lift
    10º Titanium Retainers
    10º Chrome Moly Valve Locks
    Valve Seals
    Hardened Shims
    Intake Valve Seats
    Exhaust Valve Seats
    Bronze Valve Guides Intake
    Bronze Valve Guides Exhaust
    Guide Plates
    7/16'' Exhaust Rocker Stud
    7/16'' Intake Rocker Stud
    BB Chevy Magnum Head Specifications
    Head Torque 75 Ft. Lbs.
    Intake Port Gasket 1.700'' x 2.430'' with 1/2'' radius
    Exhaust Port Gasket Standard
    Head Gasket 4.370 boreFel Pro 375-1027
    Head Gasket 4.540 boreFel Pro375-1017-1
    Head Gasket
    Mark V-VI-up to 4.500 Bore
    Fel Pro375-1017-1 or Fel Pro375-1047
    Head Gasket
    Mark V-VI-up to 4.500 Bore
    Fel Pro 375-17049
    Head Bolts & Studs Standard
    Head Bolt Washers Manley Standard
    Stud GirdleStandard
    Suggested ManifoldEdelbrock 350-2907 or 350-2927
    Spark Plug Starting RangeChampion C59C or Autolite 3932
    Combustion Chambers 115cc
    Spring Pocket can be cut to 1.750, no deeper.
    Valve Spacing Standard
    Rocker Arms Standard
    Valve Angle 24º/4º Intake, 15º/4º Exhaust
    Angle Mill.009'' per cc
    Flat Mill .006'' per cc


    Manufacturer's Part Number:

    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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    Some parts are not legal for use in California or other states with similar laws / regulations