AFR 305cc Magnum BBC Cylinder Heads 2100

Don't let their size fool you—AFR Magnum 305cc "as-cast" heads with a CNC bowl blend will provide you with flow numbers that most medium-sized heads, and some larger, can only dream about. This line was designed to optimize low and mid-lift airflow, while still generating impressive peak figures. Their application should be focused on smaller cu. in. Chevy big blocks (396-502) with a primary operating range of 2,500-6,800 rpm (this range is an average and will vary with engine displacement, as well as component selection). AFR 305cc Magnum BBC heads should also be given strong consideration in larger street-driven or marine applications up to 555 c.i.d., where low-rpm power and drivability are factors. These cylinder heads would be a great choice if you're looking for big torque and strong low-rpm performance and still have good rpm capabilities. The heads come standard with AFR's trademark 3/4 in. thick head deck, reinforced rocker stud bosses, and premium one-piece stainless steel 2.250 in. intake valves and 1.880 in. exhaust valves. Standard combustion chamber volume is 119cc. These heads are available with an optional 114cc combustion chamber as well.Brand: Airflow Research (AFR)
Manufacturer's Part Number: 2100
Part Type: Cylinder Heads
Product Line: AFR 305cc Magnum BBC Cylinder Heads
HP Direct Part Number: AFR-2100
Combustion Chamber Volume (cc): 117
Intake Runner Volume (cc): 305cc
Exhaust Runner Volume (cc): 124cc
Cylinder Head Style: Assembled
Cylinder Head Material: Cast aluminum
Camshaft Style: Solid roller
Intake Port Shape: Rectangular
Intake Valve Diameter (in.): 2.250 in.
CNC-Machined Combustion Chamber: Yes
CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Intake Port Location: Standard
Exhaust Port Shape: Round
Exhaust Port Location: Raised
Intake Valves Included: Yes
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in.): 1.880 in.
Valve Springs Included: Yes
Maximum Valve Lift (in.): 0.850 in.
Outside Diameter of Outer Spring (in.): 1.625 in.
Damper Spring Included: Yes
Number of Springs Per Valve: Dual
Retainers Included: Yes
Retainer Material: Chromoly steel
Locks Included: Yes
Lock Style: 10 degree
Valve Stem Seals Included: Yes
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
Valve Cover Mounting Style: Perimeter bolt
Accessory Bolt Holes Drilled: Yes
Intake Valve Angle: 24/4
Exhaust Valve Angle: 15/4
Valve Guides Included: Yes
Valve Guide Material: Bronze
Valve Seats Machined: Yes
Valve Seat Machine Style: 5-angle
Valve Seat Material: Ductile iron
Cylinder Head Color: Natural
Steam Holes Drilled: No
Oiling Style: Through pushrod
Machined for O-Ring: No
Heat Crossover: No
Remanufactured: No
Quantity: Sold as a pair.
Notes: Cast heads feature partially CNC ported with CNC bowl blend. Optional stud girdle required for two degree rolled valve angles and 1 in. longer head bolts needed on four bottom exhaust bolt holes. Solid Roller Dual Valve Spring w/275 lbs. on seat. 0.850 in. maximum lift.