12 Days of Christmas
1-800-345-4545
FREE SHIPPING!
Orders Over $95
Same Day Shipping Before 11 PM ET
0
My Cart
$0.00
Shop By Vehicle
Shop By
Category
All Categories

Rebates
Gift Certificates
My Account
E-Mail Signup
Catalog Request
Help

AFR - Airflow Research 3620-1

265cc Oval Port 24° Magnum Street Aluminum Cylinder Heads BB-Chevy

AFR - Airflow Research 3620-1

033-3620-1

made in usa
jegs shipping
FREE Shipping
Ships 01/05/17 if Ordered Today
AFR - Airflow Research 3620-1 265cc Oval Port 24° Magnum Street Aluminum Cylinder Heads BB-Chevy $2,365.83
265cc Oval Port 24° Magnum Street Aluminum Cylinder Heads
  • BB-Chevy
  • 113cc Combustion Chambers
  • PAC Racing 1.550'' Solid Roller Valve Spring
  • Assembled
  • Sold in Pairs, 2/pkg.

  • AFR - Airflow Research 3620-1 Details

    113cc Combustion Chambers

    Big Block Chevy 265cc Oval Port 24° Magnum Basic Package Components
    50% CNC Ported Combustion Chambers
    40% CNC Ported Exhaust Ports (Bowl Blend)
    80% CNC Ported Intake Ports (Bowl Blend) & Gasket Port Match
    Competition 5-Angle Valve Job
    Intake Valve, 2.190'' x 5.460'' o.a.l.
    Exhaust Valve, 1.880'' x 5.448'' o.a.l.
    PAC Racing 1.550'' OD Solid Roller Valve Spring, 225 lbs. on seat, .680'' maximum lift, max RPM 7200-7400
    10º 1.450'' 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 265cc Oval Port 24° Magnum Street Head Specifications
    Head Torque w/Moly Lube 75 Ft. Lbs.
    Rocker Stud Torque 55 Ft. Lbs.
    Intake Port Gasket Fel-Pro 375-1212 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
    Exhaust Port Gasket AFR 033-6858
    Head Gasket 4.540'' Bore, Fel Pro 375-1017
    AFR 033-6850
    Head Bolts & Studs Standard ARP
    Head Bolt Washers Manley Standard
    Stud Girdle AFR 033-6210
    Suggested Manifold Weiand Stealth or Edelbrock Vic Jr. or RPM Performer
    Spark Plug Starting Range Autolite 3935
    Combustion Chambers 113cc As Cast
    Intake Port Volume 265cc As Cast
    Exhaust Port Volume 115cc As Cast
    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, 97cc Maximum .009'' per cc
    Flat Mill, 102cc Maximum .006'' per cc
    NOTE: Flat and Angle mills might require a .120'' thick head gasket.

    Specifications:

    Manufacturer's Part Number:
    3620-1

    ''As-Cast'' Small Port, High Velocity, Torque Monster!

    Want to wake up the Big Block in your favorite tow vehicle? AFR's partially CNC ported 265cc high velocity oval port is just the ticket! They are also ideal on smaller cubic inch street performance applications (396-468ci), providing ''gobs'' of bottom end torque, tremendous throttle response, and great all around power. With AFR's trademark 3/4'' deck, reinforced rocker stud bosses, and thick rugged castings, you can own the strongest and most efficient heads on the market today. Premium hardware such as 2.19''/1.88'' one-piece stainless valves, 1.550'' double springs, 10-degree locks and retainers, and high quality studs and guideplates all come as standard equipment. 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. These heads have no EGR and are not emissions legal. Made in USA.

    Installation Notes: Optional stud girdle required for 2° rolled valve angles and 1'' longer head bolt needed on four bottom exhaust bolt holes.

    265cc Oval Port Magnum Street Cylinder Head Features:
  • 50% CNC Ported Combustion Chambers
  • 40% CNC Ported Exhaust Ports (Bowl Blend)
  • 80% CNC Ported Intake Ports (Bowl Blend)
  • Competition 5-angle Valve Job
  • 265cc Intake Ports
  • 115cc Exhaust Ports (as cast)
  • Intake Valve, 2.190'' x 5.460'' Overall Valve Length
  • Exhaust Valve, 1.880'' x 5.448'' Overall Valve Length
  • Hydraulic Roller Valve Spring: 1.550'' OD Hydraulic Roller Dual Valve Spring, 170 lbs on seat, 473 lbs @ .600'' maximum lift
  • Solid Roller Valve Spring: 1.550'' OD PAC Racing Solid Roller Valve Spring, 225 lbs on seat, .680'' maximum lift
  • 10° 1.450'' 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

  • Items You Need