Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 10 - Jul 15
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
GM 12643886 6.6L INTAKE MANIFOLD RHCondition: REBUILDABLE CORE USED The GM 6. 6L INTAKE MANIFOLD is engineered for heavy duty diesel applications commonly seen on Duramax powered vehicles including various Chevrolet and GMC models. Multiple sources affirm its fitment for 6. 6L engines ensuring precise air distribution and optimal engine performance. Details highlight that this manifold is designed to meet OEM standards for durability and efficiency in high mileage commercial and pickup
Condition: REBUILDABLE CORE/USEDThe GM 6.6L INTAKE MANIFOLD is engineered for heavy-duty diesel applications commonly seen on Duramax-powered vehicles including various Chevrolet and GMC models. Multiple sources affirm its fitment for 6.6L engines ensuring precise air distribution and optimal engine performance. Details highlight that this manifold is designed to meet OEM standards for durability and efficiency in high-mileage commercial and pickup trucks.
Fitment information provided with best effort, customer is ultimately responsible for fitment
Hollander Number 329-10045
| Application | Year(s) | Engine / Notes |
|---|---|---|
| SIERRA 2500 PICKUP | 17-19 | 6.6L lower R. |
| SIERRA 2500 PICKUP | 20-22 | Diesel lower R. |
| SIERRA 3500 PICKUP | 17-19 | 6.6L lower R. |
| SIERRA 3500 PICKUP | 20-22 | Diesel lower R. |
| SIERRA DENALI 2500 | 17-19 | 6.6L lower R. |
| SIERRA DENALI 2500 | 20-22 | Diesel lower R. |
| SIERRA DENALI 3500 | 17-19 | 6.6L lower R. |
| SIERRA DENALI 3500 | 20-22 | Diesel lower R. |
| SILVERADO 2500 PICKUP | 17-19 | 6.6L lower R. |
| SILVERADO 2500 PICKUP | 20 | (6.6L) Diesel lower R. |
| SILVERADO 2500 PICKUP | 21-23 | Diesel lower R. |
| SILVERADO 3500 PICKUP | 17-19 | 6.6L lower R. |
| SILVERADO 3500 PICKUP | 20 | (6.6L) Diesel lower R. |
| SILVERADO 3500 PICKUP | 21-24 | Diesel lower R. |
Part Number: 12643886
Manufacturer: GM
Weight: lbs
Additional Details:
Genuine OEM Parts
Please research/ensure fitment of part to your specific vehicle before purchasing. Returns because of non-fitment are accepted with a re-stocking fee, however customer is responsible for return shipping.
Shipping:
If shipping outside the contiguous 48 states is required, reach out to [email protected] to confirm shipping details.
About Us:
Custard Core Supply provides the highest quality of new, new take off, used, and core parts. We provide a variety of gas and diesel parts to our customers. Based in Dallas, TX Custard Core Supply has been in business since 1998. If you do not see a product you are looking for on our page, please reach out!
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 777 reviews
Sort
Product Reviews
★★★★★ 5
Adorable, functional, and great for travel
Color: A1 - Pink 1 Pack
Adorable, good quality, small but fits enough for travel. I’ve had no problems with the zipper or any of the inside functions. I like that you can remove one of the pieces to fit something larger in it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 18, 2026
★★★★★ 5
Perfect size and quality
Color: Velvet 1 Pack - Navy Blue, Color: Velvet 1 Pack - Navy Blue
This was a gift for my teen daughter she’s collecting jewelry now and this was perfect for her. This is also great for traveling! It holds lots of little pieces and feels soft. This is a great gift idea. Months later and it’s still in great condition. Easy to use and take along anywhere.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026
★★★★★ 5
Great value for the $
Color: A1 - Pink 1 Pack
My wife loves it for home and travel! We built, easy to open, sturdy, and fits her jewelry when needed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 12, 2026
★★★★★ 5
Pretty and perfect size
Color: A1 - Pink 1 Pack
Love this box is very pretty, perfect to have my everyday jewelry and perfect for travel.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
★★★★★ 5
So cutie
Color: Cloud White, Material Type: Paper, PU
This is a bit large for a travel size jewelry box lol I really thought it was going to be a bit smaller than what it was. I can see why some of the ladies in the comments are saying they’re using it as their main jewelry box since they don’t have much jewelry for a standard sized jewelry box.
With that being said, it’s cute and CAN be small enough for travel. It fits a lot and I got this one in particular bc I like that it has a bigger lower compartment for larger pieces. It’s a nice quality travel jewelry box. It’ll fit my needs. But if you have a knack for packing small and you value space. I’d say skip on this one or do due diligence to double check the measurements to see if it’s something you’re okay with packing.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 31, 2026