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Air Flow Research, CNC Ported Magnum Series Aluminum Chev BB Heads
Recommended for moderate street or street/strip big block chevys with displacements up to 509 cubic inches, operating at or below 6500 RPM. Features 100% CNC machined intake runners , exhaust ports and combustion chambers; capable of flowing 375 CFM at 0.700" of lift. Assembled heads include premium stainless steel valves, PAC Racing Springs 1.550" dual springs (.725" 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
Cylinder Head Style: Assembled
Cylinder Head Material: Cast Aluminum
Intake Runner Volume (cc): 290cc
Camshaft Style: Hydraulic Roller
Intake Port Shape: Oval
CNC-Machined Combustion Chamber: Yes
CNC-Machined Exhaust Runner: Yes
CNC-Machined Intake Runner: Yes
Intake Valve Diameter (in): 2.250"
Combustion Chamber Style: Heart
Intake Port Location: Standard
Intake Valves Included: Yes
Exhaust Port Shape: Round
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.880"
Valve Springs Included: Yes
Damper Spring Included: Yes
Maximum Valve Lift (in): 0.725"
Outside Diameter of Outer Spring (in): 1.550"
Locks Included: Yes
Lock Style: 10°
Retainers Included: Yes
Retainer Material: Chromoly Steel
Number of Springs Per Valve: Dual
Rocker Arm Nut Thread Size: 7/16"-20
Rocker Arm Studs Included: Yes
Valve Stem Seals Included: Yes
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Valve Cover Mounting Style: Perimeter Bolt
Guideplates Included: Yes
Guideplate Pushrod Size: 3/8"
Accessory Bolt Holes Drilled: Yes
Valve Guides Included: Yes
Valve Guide Material: Bronze
Valve Seats Machined: Yes
Valve Seat Machine Style: 3-Angle
Intake Valve Angle: 24/4
Exhaust Valve Angle: 15/4
Valve Seat Material: Ductile Iron
Machined for O-Ring: No
Oiling Style: Through pushrod
Steam Holes Drilled: No
Cylinder Head Color: Natural
Heat Crossover: No
Remanufactured: No
Quantity Sold as: A Pair
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