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AFR – Airflow Research 3620 – AFR Big Block Chevy 265cc Oval Port Magnum Aluminum Cylinder Heads

$2,158.25

AFR – Airflow Research# 3620

265cc Oval Port 24° Magnum Street Aluminum Cylinder Heads

  • BB-Chevy
  • 109cc Combustion Chambers
  • PAC Racing 1.550” Solid Roller Valve Spring
  • Assembled
  • Sold in Pairs, 2/pkg.

SKU: 3620. Categories: , .

Product Description

AFR – Airflow Research 3620 – AFR Big Block Chevy 265cc Oval Port Magnum Aluminum Cylinder Heads Details

109cc 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 1212 – DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
Exhaust Port Gasket AFR 6858
Head Gasket 4.540” Bore, Fel Pro 1017
AFR 6850
Head Bolts & Studs Standard ARP
Head Bolt Washers Manley Standard
Stud Girdle AFR 6210
Suggested Manifold Weiand Stealth or Edelbrock Vic Jr. or RPM Performer
Spark Plug Starting Range Autolite 3935
Combustion Chambers 109cc 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.