Engines and Components Cylinder Heads and Components

ENGINEQUEST

GM Duramax Diesel V Cylinder Head

$755.49

SKU: EQ-CH402B

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In Stock
Ships by Sep 9
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Overview

The EngineQuest EQ-CH402B is a GM Duramax Diesel V cylinder head designed to meet or exceed OEM specifications. This cylinder head is manufactured using the highest grade of material, featuring thicker decks for enhanced strength and a superior port finish for increased flow.
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The EngineQuest EQ-CH402B is a V cylinder head engineered for GM Duramax Diesel engines, designed to meet or exceed original equipment manufacturer (OEM) specifications. Manufactured from the highest grade of material, it offers increased strength through thicker decks and improved flow characteristics thanks to a superior port finish. This design also helps to resist cracking, providing a more robust and durable component for your engine. Key specifications include a port volume of 246cc, a valve head diameter of 2.00 inches, and intake valves measuring 2.06 inches by 3/8 inches by 5.22 inches. The exhaust valves are 1.72 inches by 3/8 inches by 5.35 inches. The chamber volume is 71cc +/- 2cc, and it features stock spark plug location. The material is cast iron. This cylinder head is specifically designed for 2006-2007 Chevrolet Silverado 2500 HD, 2500 HD Classic, 3500, and 3500 Classic models, as well as 2006-2007 GMC Sierra 2500 HD, 2500 HD Classic, 3500, and 3500 Classic models. It is compatible with the 6.6L V8 Duramax Diesel engine, particularly those with the LBZ casting/OEM designation (VIN code 'D').

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

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Specifications

BrandENGINEQUEST
Part NumberEQ-CH402B
CategoryEngines and Components

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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