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AFR – Airflow Research 2101-1 – AFR Big Block Chevy 325cc Rectangle Port Magnum Aluminum Cylinder Heads

$2,703.39

AFR – Airflow Research# 2101-1

325cc Rectangle Port 24° Magnum Aluminum Cylinder Heads

  • BB-Chevy
  • 121cc Combustion Chambers
  • 1.625” Valve Spring
  • 275 lbs. Seat Pressure
  • .850” Max Lift
  • 100% CNC Combustion Chambers
  • Assembled
  • Sold in Pairs, 2/pkg.

SKU: 2101-1. Categories: , .

Product Description

AFR – Airflow Research 2101-1 – AFR Big Block Chevy 325cc Rectangle Port Magnum Aluminum Cylinder Heads 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, .850” 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 Specifications
Head Torque w/Moly Lube 75 Ft. Lbs.
Rocker Stud Torque 55 Ft. Lbs.
Intake Port Gasket, 1.720” x 2.450” with 1/2” radius Fel-Pro 1275 – DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
Exhaust Port Gasket AFR 6858
Head Gasket Mark IV 4.540” Bore, Fel Pro 1017
AFR 6850
Head Gasket Mark V – VI Up to 4.500” Bore, Fel Pro 1047
Head Gasket Mark V – VI 4.500” to 4.600” Bore, Fel Pro 17049
Head Bolts & Studs Standard ARP
Head Bolt Washers Manley Standard
Stud Girdle AFR 6210
Suggested Manifold Edelbrock 2907 & 2927 or Brodix HV2000 & HV2001
Spark Plug Starting Range Champion C59C, Autolite 3932
Combustion Chambers 121cc Fully CNC’d
Intake Port Volume 325cc Partially Ported
Exhaust Port Volume N/A
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, 104cc Maximum .009” per cc
Flat Mill, As Cast 108cc, CNC 114cc Maximum .006” per cc
NOTE: Flat and Angle mills might require a .120” thick head gasket.