DART MACHINERY
Dart SHP Pro LS3 CNC Cylinder Head 129421 - 266cc Rectangle Port, Assembled
- Part Number:
- 129421
- MPN:
- 129421
- Availability:
- Ships from manufacturer
- Shipping:
- Free Over $98 In U.S. 48
- Type:
- LS3 Cylinder Heads
- Material:
- Aluminum
- Assembled:
- Yes
- CNC Ported:
- Yes
- Bolts Per Cylinder:
- 6
- Valve Angle (degrees):
- 11
- Valve Springs Included:
- Yes
- Valve Spring Type:
- Dual
- Valve Spring Max Lift (in.):
- .650
- Intake Runner Volume (cc):
- 266
- Chamber Volume (cc):
- 70
- Intake Valve (in.):
- 2.165
- Exhaust Valve (in.):
- 1.625
- Accessory Holes:
- Yes
- Quantity:
- Sold Individually
Description
Dart SHP Pro LS3 CNC Cylinder Head 129421 - 266cc Rectangle Port, Assembled
1.295” Dual Valve Springs for Hydraulic Roller. 70CC Chamber .650 Max Lift
Designed with an 11° valve angle, the SHP PRO 266cc cylinder head outperforms standard LS castings by improving airflow and efficiency while retaining compatibility with factory LS3 valvetrain components, intake manifold mounting, and stock accessory mounting points. These heads feature a .750" thick deck for added durability and O- ringed exhaust ports, eliminating the need for exhaust gaskets. The assembled heads come equipped with stainless valves, PAC Racing springs, locks, and retainers. With CNC-machined intake and exhaust ports, as well as combustion chambers, this head offers superior airflow, more efficient combustion, and greater versatility.
Features:
• Full CNC Machining: Precision-machined Intake, Exhaust and Chambers enhance airflow and combustion
efficiency, providing optimal performance for high-powered applications.
• 750" Deck Thickness: Specifically designed for increased cylinder pressure, offering superior strength and
reliability in demanding high-performance environments.
• 11° Valve Angle: Maintains compatibility with factory LS3 valve train components while offering improved
flow dynamics for increased horsepower potential.
• Available in Bare or Fully Assembled: Fully assembled options include premium components: Manley valves,
PAC springs, locks, and retainers, providing a ready-to-install solution for builders and racers.