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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
$1,099.99

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.

 

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Warranty Information

Dart Machinery, Ltd. warrants to the original purchaser its products to be free from defects in materials and workmanship under normal and recommended use and that the products will conform to Darts published specifications or, if applicable, Buyers specifications to the extent accepted by Dart in a separate writing. Darts obligation under this warranty shall be limited to repair or replacement, at Darts option, of any parts or products which may prove defective under normal use within six (6) months from the date of sale, and which the examination of Dart Machinery, Ltd. reveals to its satisfaction that the products in question are in fact defective. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR USE AND OF ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF DART MACHINERY, LTD. THE PURCHASER ACKNOWLEDGES THAT HE IS NOT RELYING ON DART MACHINERY, LTD.S SKILL OR JUDGMENT TO SELECT OR FURNISH GOODS SUITABLE FOR ANY PARTICULAR PURPOSE AND THAT THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF. THE WARRANTY CONTAINED HEREIN SHALL NOT APPLY TO ANY PART OR PRODUCT WHICH HAS BEEN SUBJECT TO ACCIDENT, NEGLIGENCE, ALTERATION, ABUSE, OR MISUSE. DART MACHINERY, LTD. MAKES NO WARRANTY WHATSOEVER IN RESPECT TO ACCESSORIES OR PARTS NOT SUPPLIED BY DART MACHINERY, LTD. THIS WARRANTY SHALL APPLY ONLY WITHIN THE BOUNDARIES OF THE CONTINENTAL UNITED STATES. Any affirmation of fact or promise made by Dart Machinery, Ltd. shall not be deemed to create an express warranty that the product shall conform to the affirmation or promise; any description of the product is for the sole purpose of identifying it and shall not be deemed to create an express warranty that the product shall conform to such description; any sample or model is for illustrative purposes only and shall not be deemed to create an express warranty that the product shall conform to the sample or model; and no affirmation or promise, or description, or sample or model shall be deemed part of the basis of the bargain.
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