Airflow Research Competition CNC Ported Aluminum Chev SB Head
These heads feature 100% competition high detail CNC ported intake runners, exhaust runners, and combustion chambers. Other features include angle plugs, hardened ductile iron interlocking valve seats, and 3/4" thick decks (great for supercharger and nitrous applications). Available with standard or spread port exhaust.
Fully assembled with 2.100"/1.600" stainless steel valves, 1.550" mechanical roller springs, 10 deg. locks/retainers, bronze guides, 7/16" studs, and guide plates. Heads have 60/40 valve spacing (requires offset stud girdles).
Part Type: Cylinder Head
Application: Chevrolet Small Block
Cylinder Head Material: Aluminum
Bare or Assembled: Assembled
Combustion Chamber Size: 65cc
CNC Machined Combustion Chambers: Yes
Intake Valve Angle: 23
Exhaust Valve Angle: 23
Intake Port Volume: 227cc
CNC Machined Intake Port: Yes
Intake Port Flow: 329 cfm @ .700" Lift / 28"
Intake Port Location: Standard
Intake Port Shape: Rectangular
Intake Port Dimensions: 2.240" x 1.310"
Suggested Intake Gaskets: Fel-Pro #1206 or Equivalent
Exhaust Port Volume: 80cc
CNC Machined Exhaust Port: Yes
Exhaust Port Flow: 245 cfm @ .700" Lift / 28"
Exhaust Port Location: .250” Raised
Exhaust Port Shape: Square
Exhaust Port Dimensions: 1.420” x 1.545"
Suggested Exhaust Gaskets: Fel-Pro #1405
Spark Plug Style: Angled
Suggested Spark Plug: 14mm x .750"
Valve Guides: Yes (Bronze)
Valve Guide Spacing:
Valve Stem Diameter: 8mm
Valve Seats: Yes (Ductile Iron)
Valve Job: 5-Angle
Intake Valve Diameter: 2.100"
Intake Valve Included: Yes
Exhaust Valve Diameter: 1.600"
Exhaust Valve Included: Yes
Suggested Valve Length: Intake: 5.000"/Exhaust: 5.030"
Valve Spring Pockets: 1.680” O.D. (Do not machine spring pad any deeper!)
Valve Springs Included: Yes, 1.550"
Valve Spring Application: Mechanical Roller, 220lbs. Seat, .710" Max Lift
Valve Springs Retainers Included: Yes
Valve Locks Included: Yes (10 Degree)
Valve Seals Included: Yes
Rocker Studs Included: Yes (7/16")
Guide Plates Included: Yes
Valve Cover Mounting Style: Perimeter
Steam Holes Drilled: No
Heat Crossover: No
Suggested Head Bolts: ARP #134-3701 or Equivalent
Suggested Head Studs: ARP #234-4301 or Equivalent
Suggested Stud Girdle: Jomar #1106 or Airflow Research #6200
Head Bolt Torque with Oil: 65 ft./lbs.
Rocker Stud Torque with Oil: 55 ft./lbs.
Intake Bolt Torque with Oil: 25 ft./lbs.
Manufacturer: Airflow Research
Manufacturer's Part Number: 1121
Weight: 68.0 lbs.
Warranty: https://www.airflowresearch.com/warranty/
Quantity: Sold as Pair |