10971143 - 1.550? Dual Springs for Solid Roller Cam .660?
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?ø 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.
Features
- Cylinder Head Style:
- Assembled
- Cylinder Head Material:
- Cast iron
- Cylinder Head Finish:
- Natural
- CNC-Machined Combustion Chamber:
- Yes
- Combustion Chamber Volume (cc):
- 72cc
- Combustion Chamber Style:
- Heart
- CNC-Machined Intake Runner:
- Yes
- Intake Runner Volume (cc):
- 227cc
- Intake Port Shape:
- Rectangular
- Intake Port Location:
- Standard
- Intake Valve Angle:
- 23 degree
- CNC-Machined Exhaust Runner:
- Yes
- Exhaust Runner Volume (cc):
- 92cc
- Exhaust Port Shape:
- Square
- Exhaust Port Location:
- Standard
- Exhaust Valve Angle:
- 23 degree
- Intake Valves Included:
- Yes
- Intake Valve Diameter (in.):
- 2.080 in.
- Exhaust Valves Included:
- Yes
- Exhaust Valve Diameter (in.):
- 1.600 in.
- Valve Type:
- N/A
- Maximum Valve Lift (in.):
- 0.600 in.
- Valve Springs Included:
- Yes
- Valve Spring Type:
- Dual
- Outside Diameter of Outer Spring (in.):
- 1.550 in.
- Valve Guides Included:
- Yes
- Valve Guide Material:
- Bronze
- Valve Seats Machined:
- Yes
- Valve Seat Material:
- Powdered metal
- Valve Seat Machine Style:
- 4-angle intake/3-angle exhaust
- Retainers Included:
- Yes
- Retainer Material:
- Titanium
- Valve Stem Seals Included:
- Yes
- Valve Stem Seal Style:
- Positive Stop
- Locks Included:
- Yes
- Lock Style:
- N/A
- Camshaft Style:
- N/A
- Spark Plug Style:
- Angled
- Guideplates Included:
- No
- Guideplate Pushrod Size:
- N/A
- Rocker Arm Studs Included:
- No
- Rocker Arm Nut Thread Size:
- N/A
- Accessory Bolt Holes Drilled:
- Yes
- Valve Cover Mounting Style:
- Center and perimeter bolt
- Heat Crossover:
- No
- Steam Holes Drilled:
- No
- Oiling Style:
- Through pushrod
- Machined for O-Ring:
- No
- Quantity:
- Sold individually.
- Notes:
- Valve Spring Pressure, 690 lbs open, 215 lbs closed. Spark Plug Type 0.460 Reach
- Make:
- Chevrolet
- Engine Family:
- Chevy small block Gen I
- Engine Sizes:
- 5.0L/305-5.7L/350
- Years:
- 1962-1986