Partsology
Cylinder Head Gasket set with Head Bolt Kit 2004–2010 Chevy and GMC 6.6L V8
Cylinder Head Gasket set with Head Bolt Kit 2004–2010 Chevy and GMC 6.6L V8
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DNJ Cylinder Head Gasket set with Head Bolt Kit
Includes: Head Gasket Set x1, Head Bolt Kit x1.
Engine Designation: LBZ, LLY
Buyers Guide: [2004-2010] Chevrolet, GMC, Hummer Express 2500, Express 3500, Express 4500 6.6L 32V V8 6599cc
Part Warranty: 12-month or 12,000-mile warranty, whichever comes first. Warranty must be requested by the original purchaser and is limited to the replacement of the alleged defective part(s) only.
2004–2010 Chevy and GMC 6.6L V8 Duramax Cylinder Head Gasket Set
The Partsology HGB3221 cylinder head gasket set with head bolt kit is designed for 2004–2010 Chevy and GMC vehicles equipped with the legendary 6.6L V8 Duramax diesel engine, a platform known for its durability, towing strength, and long service life. This OEM-quality gasket set fits popular heavy-duty models like the Chevy Silverado 2500/3500 HD and GMC Sierra 2500/3500, as well as commercial workhorses such as the GMC Savana and Chevrolet Express vans, and even the 2006 Hummer H1. Replacing your head gasket set before failure is critical, as a failing gasket can lead to coolant loss, overheating, white exhaust smoke, oil contamination, or a noticeable drop in engine performance. Catching these warning signs early helps prevent costly engine damage and extended downtime. This kit includes new head bolts, which are important because factory bolts are torque-to-yield and should not be reused, ensuring proper clamping force and a reliable seal once installed. Partsology supplies OEM-quality engine parts at amazing prices, giving you confidence in both fitment and long-term performance, with the added benefit of overnight delivery to get your truck or van back on the road fast.
Shipping & Returns
Shipping & Returns
Shipping on most orders in 24-48 hours special orders can be 2-3 days. Returns see Returns Policy.
We have a 30-day return policy on most products, which means you have 30 days after receiving your item to request a return. Some products carry a longer manufacture warranty please contact us if you have questions about items.
To be eligible for a return, your item must be in the same condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at overthehilltractor@gmail.com. Please note that returns will need to be sent to the following address: 2005 Stuarts Draft Hwy, Stuarts Draft, VA 24477
If your return is accepted at damage or defective, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
If your return is due to no longer needed, wrong size order, ordered by mistake, found better pricing, etc the customer is responsible for the return shipping cost.
Any item returned over $50 cost we suggest insurance on package.
You can always contact us for any return question at overthehilltractor@gmail.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, we can only give 72 hours from time package is scanned delivered to accept claims. Please contact within 72 hours of delivery so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, like fuel related items due to hazardous materials shipping regulations. We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Electrical parts can only be returned if new and in original condition, Used electrical parts are not returnable unless actually defective, contact us with details.
Unfortunately, we cannot accept returns on sale items or gift cards.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at overthehilltractor@gmail.com.
Most items are covered by 30 day warranty, Fuel Related parts are only covered against actually manufacture defect since the fuel produced today breaks down gaskets and seals quickly. Electrical parts can only be returned if new and in original condition, Used electrical parts are not returnable unless actually defective, contact us with details. Returns are handled on each individual item, some items will not require return for refund just that customer submit picture of proof of issue. Please contact us with questions about returns.

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Free Shipping
Free shipping on orders over $150
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