Brand:

Airflow Research (AFR)

Manufacturer’s Part Number:

1121

Part Type:

Cylinder Heads

Summit Racing Part Number:

AFR-1121

Combustion Chamber Volume (cc):

65

Intake Runner Volume (cc):

227cc

Exhaust Runner Volume (cc):

80cc

Cylinder Head Style:

Assembled

Cylinder Head Material:

Aluminum

Intake Port Shape:

Rectangular

Intake Valve Diameter (in.):

2.100 in.

CNC-Machined Combustion Chamber:

Yes

CNC-Machined Intake Runner:

Yes

CNC-Machined Exhaust Runner:

Yes

Combustion Chamber Style:

Heart

Intake Port Location:

Standard

Exhaust Port Shape:

Square

Exhaust Port Location:

Raised

Spark Plug Style:

Angle

Intake Valves Included:

Yes

Exhaust Valves Included:

Yes

Exhaust Valve Diameter (in.):

1.600 in.

Valve Springs Included:

Yes

Maximum Valve Lift (in.):

0.710 in.

Camshaft Style:

Solid roller

Outside Diameter of Outer Spring (in.):

1.550 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

Guideplate Pushrod Size:

5/16 in.

Valve Cover Mounting Style:

Perimeter bolt

Accessory Bolt Holes Drilled:

Yes

Intake Valve Angle:

23

Exhaust Valve Angle:

23

Valve Guides Included:

Yes

Valve Guide Material:

Bronze

Valve Seats Machined:

Yes

Valve Seat Machine Style:

3-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

Quantity:

Sold as a pair.

Notes:

60/40 Valve Spacing ,not compatible with self-aligning rocker arms. .050 Off-set or shaft mount rocker arms recommended for optimized Geometry. Exhaust port is raised 0.250 in. over stock. These cylinder heads are competition ported. Valve springs are designed for mechanical roller camshafts.