$$1,116.62Engine \ Cylinder Heads \ Chevy Small Block Cast Iron Heads10971142
DAT10971142
Dart 10971142 Iron Eagle 23 Deg. Cylinder Heads, Cast Iron, 227cc intake, 72cc Comb.
10971142 - 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620” Fully CNC ported. Maximum performance/full competition, unlimited oval and super classes. 7,000+ RPM, 400+ cubic inch engines. Completely CNC machined, the Iron Eagle 23° 227cc CNC heads offer ultimate consistency and performance. With intake ports designed to ...
Dart10971142 Iron Eagle 23 Deg. Cylinder Heads, Cast I

Dart

Dart 10971142 Iron Eagle 23 Deg. Cylinder Heads, Cast Iron, 227cc intake, 72cc Comb.

$1,116.62

Item #: DAT10971142

Mfg Part #: 10971142

Applies To Continental U.S. orders only

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Qty Available: 0

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Specifications
Cylinder Head Specifications
Cylinder Head Style
Assembled
Cylinder Head Material
Cast iron
Cylinder Head Finish
Natural
Combustion Chamber Volume (cc)
72
CNC-Machined Combustion Chamber
Yes
Intake Runner Volume (cc)
227cc
Exhaust Runner Volume (cc)
92cc
Combustion Chamber Style
Heart
CNC-Machined Intake Runner
Yes
CNC-Machined Exhaust Runner
Yes
Intake Port Shape
Rectangular
Intake Port Location
Standard
Exhaust Port Shape
Square
Exhaust Port Location
Standard
Intake Valve Diameter (in)
2.080 in.
Spark Plug Style
Angeled
Spark Plug Type
.460 Reach,
Intake Valves Included
Yes
Exhaust Valves Included
Yes
Exhaust Valve Diameter (in)
1.600 in.
Valve Springs Included
Yes
Valve Spring Type
Dual
Maximum Valve Lift (in)
.620 in.
Outside Diameter of Outer Spring (in)
1.437 in.
Valve Spring Pressure Closed
130 lbs.
Valve Spring Pressure Open
600 lbs.
Retainers Included
Yes
Retainer Material
Steel
Locks Included
Yes
Valve Stem Seals Included
Yes
Valve Stem Seal Style
Positive Stop
Rocker Arm Studs Included
No
Rocker Arm Studs Size
7/16-20 in.
Rocker Arms Included
No
Rocker Arm Nuts Included
No
Guideplates Included
No
Valve Cover Mounting Style
Center and 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
4-angle intake/3-angle exhaust
Valve Seat Material
Powdered metal
Steam Holes Drilled
No
Oiling Style
Through pushrod
Machined for O-Ring
No
Heat Crossover
No
Quantity
Sold individually.
Applications
Make
CHEVROLET
Engine Family
Chevy small block Gen I
Engine Size
5.0L/305-5.7L/350
Years
1962-1986
General
Brand
Dart
Item #
DAT10971142
Mfg Part #
10971142
Description

10971142 - 1.437” Dual Springs for Hydraulic Roller or Solid Flat Tappet Cam .620”

Fully CNC ported. Maximum performance/full competition, unlimited oval and super classes. 7,000+ RPM, 400+ cubic inch engines.

Completely CNC machined, the Iron Eagle 23° 227cc CNC heads offer ultimate consistency and performance. With intake ports designed to optimize fuel/air flow efficiency and combustion chambers that offer a more complete and rapid burn, these heads are perfect for big inch small blocks.

Standard valve angle and spacing are retained to allow use of off the shelf pistons and valve train components.

Hardened exhaust seats are compatible with unleaded gasoline. Manganese Bronze valve guides extend cylinder head life.

Heads are sold individually.

  • Material: High Nickel 220 BHN Cast Iron
  • Valve Angle: 23° (stock)
  • Intake Port Volume: 227cc CNC
  • Intake Valve: 2.080”
  • Exhaust Valve: 1.600”
  • Chamber Volume: 72cc
  • Plug Type: Angle
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