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Airflow Research CNC Ported Magnum Series Aluminum Chev BB Head
Are you looking for big torque and big horsepower? AFR's Fully CNC ported heads are available with an intake runner size from a super high torque 315cc to the all out 357cc. CNC ported heads for almost every Chev big block application. They all feature AFR's trademark .750" thick decks and reinforced rocker stud bosses.
Assemblied heads include premium stainless steel valves, 1.625" dual roller springs (.850" max lift), 10° titanium retainers and locks, 7/16" studs and guide plates.
*Features titanium retainers
Part Type: Cylinder Head
Application: Chevrolet Big Block
Cylinder Head Material: Aluminum
Bare or Assembled: Assembled
Combustion Chamber Size: 121cc
CNC Machined Combustion Chambers: Yes
Intake Valve Angle: 24
Exhaust Valve Angle: 24
Intake Port Volume: 385cc
CNC Machined Intake Port: Yes
Intake Port Flow: 456 cfm @ .900" Lift/ 28"
Intake Port Location: Standard
Intake Port Shape: Rectangular
Intake Port Dimensions: 2.565" x 1.810"
Suggested Intake Gaskets: Fel-Pro 1275 or Equivalent
Exhaust Port Volume: 135cc
CNC Machined Exhaust Port: Yes
Exhaust Port Flow: 350 cfm @ .900" Lift/ 28"
Exhaust Port Location: Raised .375"
Exhaust Port Shape: D-Shaped
Exhaust Port Dimensions: 1.780" x 2.025"
Suggested Exhaust Gaskets: Fel-Pro 1412 or Equivalent
Spark Plug Style:
Suggested Spark Plug: 14mm, .750 reach
Valve Guides: Yes
Valve Guide Spacing:
Valve Stem Diameter: 11/32" (.3415")
Valve Seats: Yes
Valve Job: 5-Angle
Intake Valve Diameter: 2.300"
Intake Valve Included: Yes
Exhaust Valve Diameter: 1.880"
Exhaust Valve Included: Yes
Suggested Valve Length:
Valve Spring Pockets: 1.725" O.D. (1.750" MAX.)
Valve Springs Included: Yes, 1.625" Dual
Valve Spring Application: Mechanical Roller, 275lbs. Seat, .850” Max Lift
Valve Springs Retainers Included: Yes (Titanium)
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 Bolt
Steam Holes Drilled: No
Heat Crossover: No
Suggested Head Bolts: ARP 135-3703 (Mark IV) ARP 135-3707 (Mark V)
Suggested Head Studs: ARP 235-4713
Suggested Stud Girdle:
Head Bolt Torque with Oil: 75 ft./lbs.
Rocker Stud Torque with Oil: 55-60 ft./lbs.
Intake Bolt Torque with Oil:
Manufacturer: Airflow Research
Manufacturer's Part Number: 2020
Weight:
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Pair
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