Brand: Airflow Research (AFR)
Manufacturer's Part Number: 3708
Part Type: Cylinder Heads
Product Line: AFR 457cc Magnum BBC 18 Degree Cylinder Heads
Automotive Fittings Part Number: AFR-3708
Combustion Chamber Volume (cc): 90
Intake Runner Volume (cc): 457cc
Exhaust Runner Volume (cc): 143cc
Cylinder Head Style: Assembled
Cylinder Head Material: Cast aluminum
Intake Port Shape: Rectangular
Intake Valve Diameter (in.): 2.400 in.
CNC-Machined Combustion Chamber: Yes
CNC-Machined Intake Runner: Yes
CNC-Machined Exhaust Runner: Yes
Combustion Chamber Style: Open chamber
Intake Port Location: Raised
Exhaust Port Shape: Round
Exhaust Port Location: Raised
Intake Valves Included: Yes
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in.): 1.800 in.
Valve Springs Included: Yes
Maximum Valve Lift (in.): 0.950 in.
Camshaft Style: Solid roller
Outside Diameter of Outer Spring (in.): 1.645 in.
Damper Spring Included: Yes
Number of Springs Per Valve: Single
Retainers Included: Yes
Retainer Material: Titanium
Locks Included: Yes
Lock Style: 10 degree
Valve Stem Seals Included: Yes
Valve Stem Seal Style: Positive stop
Rocker Arm Studs Included: Yes
Rocker Arm Nut Thread Size: 7/16 in.-20
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Guideplates Included: Yes
Guideplate Pushrod Size: 3/8 in.
Valve Cover Mounting Style: Perimeter bolt
Accessory Bolt Holes Drilled: Yes
Intake Valve Angle: 18
Valve Guides Included: Yes
Valve Guide Material: Manganese bronze
Valve Seats Machined: Yes
Valve Seat Machine Style: 5-angle intake/3-angle exhaust
Valve Seat Material: Ductile iron
Cylinder Head Color: Natural
Steam Holes Drilled: No
Oiling Style: Through head
Machined for O-Ring: No
Heat Crossover: No
Remanufactured: No
Quantity: Sold individually.
Description:
AFR 457cc Magnum BBC 18 degree cylinder heads were built specifically for high horsepower race applications. The Magnum 18 heads flow an impressive 498 cfm at 1.000 in. lift with 457cc runners, 90cc combustion chamber, and 143cc exhaust. The intake ports are raised .500 in. with the valves rolled to 18 degree, resulting in unparalleled under-the-curve flow numbers. These big block Chevy heads are ideal for 540 cu. in. or larger race engines. AFR has been defining what it means to make power on Chevy engines for years. Now you can strap on a pair of their best performing, highest flowing heads, their 457cc Magnum BBC 18 degree cylinder heads.