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XDP Billet Coolant Block-Off Plate for 2011-2024 GM 6.6L Duramax LML/L5P
SKU: XDP-XD344
XDP HD Billet Coolant Block-Off Plate
Upgrade your 2011-2024 GM 6.6L Duramax engine with the XDP Billet Coolant Block-Off Plate, designed to permanently prevent coolant leaks from the rear housing. Crafted from CNC-machined billet aluminum with a built-in o-ring seal and a sleek black anodized finish, this plate ensures a durable, leak-free installation using your factory hardware.
- Free shipping
2001–2025 GM 6.6L Duramax XDP HD Billet Coolant Block-Off Plate XD344
Eliminate rear housing coolant leaks for good with the XDP HD Billet Coolant Block-Off Plate XD344, engineered for 2001–2025 GM 6.6L Duramax LB7, LLY, LBZ, LMM, LML, and L5P engines. This precision-machined plate offers a permanent fix to a common failure point by replacing the factory cover that can warp or degrade over time. With its billet aluminum construction and built-in O-ring seal, the XD344 ensures a reliable, leak-free seal that outperforms OEM gaskets.
- Fits all 2001–2025 6.6L Duramax engines (LB7, LLY, LBZ, LMM, LML, L5P)
- Eliminates rear housing coolant leaks for long-term reliability
- CNC-machined billet aluminum for exceptional strength and durability
- Integrated O-ring seal for a secure, leak-free installation
- Black anodized finish for corrosion resistance and a clean appearance
- Direct-fit design reuses factory hardware—no modifications needed
- Backed by XDP's 1-year warranty against defects in materials and craftsmanship
Fitment:
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 Chevrolet Silverado 2500 HD LT
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 Chevrolet Silverado 2500 HD LTZ
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 Chevrolet Silverado 2500 HD WT
2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 Chevrolet Silverado 2500 HD High Country
2020, 2021, 2022, 2023, 2024, 2025 Chevrolet Silverado 2500 HD Custom
2024 Chevrolet Silverado 2500 HD ZR2
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 Chevrolet Silverado 3500 HD LT
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 Chevrolet Silverado 3500 HD LTZ
2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 Chevrolet Silverado 3500 HD High Country
2011, 2012, 2013, 2014 Chevrolet Silverado 3500 HD WT
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 GMC Sierra 2500 HD SLE
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 GMC Sierra 2500 HD SLT
2011, 2012, 2013, 2014 GMC Sierra 2500 HD WT
2015, 2016, 2017, 2018, 2019, 2020, 2021 GMC Sierra 2500 HD
2020, 2021, 2022, 2023, 2024, 2025 GMC Sierra 2500 HD AT4
2022, 2023, 2024, 2025 GMC Sierra 2500 HD Pro
2024 GMC Sierra 2500 HD Denali Ultimate
2024 GMC Sierra 2500 HD AT4X
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 GMC Sierra 2500 HD Denali
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 GMC Sierra 3500 HD SLT
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 GMC Sierra 3500 HD SLE
2011, 2012, 2013, 2014 GMC Sierra 3500 HD WT
2015, 2016, 2017, 2018, 2019, 2020, 2021 GMC Sierra 3500 HD
2020, 2021, 2022, 2023, 2024, 2025 GMC Sierra 3500 HD AT4
2022, 2023, 2024, 2025 GMC Sierra 3500 HD Pro
2024 GMC Sierra 3500 HD Denali Ultimate
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 GMC Sierra 3500 HD Denali
- ManufacturerXtreme Diesel Performance (XDP)
- BrandXtreme Diesel Performance (XDP)
- MPNXD344
- Part Number_333224XD344
- Part NumberXD344
- Brand NameXtreme Diesel Performance (XDP)
- VendorXtreme Diesel Performance (XDP)
Shipping
We utilize UPS, Fedex, and USPS for all of our shipping needs. Carrier choice is based upon availability and needs of the customer and is the sole discretion of SouthernCarParts. We always try to ship within 24 hours of order placement (do to the custom nature of some products, shipping within 24 hours is impossible, actual shipping time frames will be listed in the product description). Please keep in mind that some products such as Custom Fit Car Covers, Lloyds Floor Mats, Painted accessories, and Racemesh Products can take 3 -10 days to ship and are charged at time of order placement. Racemesh products take 4 weeks to ship as they are made to order.
Returns
Should you need to return a part for refund, exchange, or credit, please contact our returns department within 30 days of purchase at orders@southerncarparts.com for a Return Merchandise Authorization (RMA) number. Most problems, such as installation, can be solved with a telephone call (888-631-1433). Southern Car Parts will not accept returned goods without prior authorization and an RMA# written clearly on the exterior of the box. The customer is responsible for freight on all return orders. Parts authorized to be returned, on a non-exchange basis, are subject to a 20% restocking fee. Returns will only be accepted within 30 days of the original date of shipment. Custom painted parts - Once these parts are started, we can refund you less the paint(chemicals) that have been used. Exception is rear spoilers and front splitters, we can refund less 20%.
Custom-made-to-order items are NOT returnable. This includes embroidered floor mats, interior embroidered items, Decals, Stripes, and car covers.
Damages in Shipping
All damages from shipping must be reported to Southern Car Parts within two business days from tracking number delivery confirmation. After two business days, damages become the responsibility of the customer.