Air Flow Research, CNC Ported Magnum Series Aluminum Chev BB Heads
Are you looking for big torque and big horsepower? Features 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Available intake runner size from a high torque 315cc to the all out 385cc. They all feature AFR's trademark .750" thick decks and reinforced rocker stud bosses. Assembled heads include premium stainless steel valves, PAC Racing Springs 1.625" dual springs (.850" max lift), 10° retainers and locks, 7/16" studs, and guide plates.
- 100% CNC Ported Intake Ports
- 100% CNC Ported Exhaust Ports
- 100% CNC Ported Combustion Chambers
- Competition 5-angle Valve Job
- Viton Valve Seals
- PAC 1.625" Mechanical Roller Valve Springs
- 10° Machined Bead Lock Valve Keepers with lash cap recess
Part Type: Cylinder Heads
Combustion Chamber Volume (cc): 113
Intake Runner Volume (cc): 300cc
Cylinder Head Style: Assembled
Cylinder Head Material: Cast Aluminum
Intake Port Shape: Oval
Camshaft Style: Solid Roller
Intake Valve Diameter (in): 2.300"
CNC-Machined Combustion Chamber: Yes
CNC-Machined Exhaust Runner: Yes
CNC-Machined Intake Runner: Yes
Intake Port Location: Standard
Intake Valves Included: Yes
Exhaust Port Shape: Round
Exhaust Port Location: Standard
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.880"
Valve Springs Included: Yes
Locks Included: Yes
Lock Style: 10°
Guideplates Included: Yes
Guideplate Pushrod Size: 3/8"
Rocker Arm Studs Included: Yes
Rocker Arm Nut Thread Size: 7/16"-20
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Valve Stem Seals Included: Yes
Valve Cover Mounting Style: Perimeter Bolt
Maximum Valve Lift (in): 0.850"
Outside Diameter of Outer Spring (in): 1.550"
Number of Springs Per Valve: Dual
Retainers Included: Yes
Retainer Material: Chromoly Steel
Accessory Bolt Holes Drilled: Yes
Intake Valve Angle: 24
Exhaust Valve Angle: 24
Valve Seat Material: Ductile Iron
Valve Seat Machine Style: 5-Angle
Valve Seats Machined: Yes
Valve Guides Included: Yes
Valve Guide Material: Bronze
Valve Seats Machined: Yes
Cylinder Head Color: Natural
Steam Holes Drilled: No
Oiling Style: Through pushrod
Machined for O-Ring: No
Remanufactured: No
Heat Crossover: No
Quantity Sold as: A Pair
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