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XDP HD Billet Coolant Block-Off Plate XD344
PART#
XD344 | SKU XD344
★★★★★
Vehicle Fitment For:
2001-2025 GM 6.6L Duramax LB7/LLY/LBZ/LMM/LML/L5P
See full application list below
$64.95
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Description
Put the XDP HD Billet Coolant Block-Off Plate XD344 in your GM 6.6L Duramax to permanently eliminate coolant leaks from the rear housing on your Duramax engine. The factory cover uses a gasket and over time the plate can warp, and the gaskets can corrode causing coolant leaks. The XD344 is made from CNC-machined billet aluminum and features a built-in O-ring seal for a leak-free installation. Each coolant block-off plate comes with a black anodized finish and is ready to install re-using your factory hardware.
Features:
- Built-In O-Ring Seal
- Black Anodized Finish
- Billet Aluminum Construction
- Eliminate Rear Housing Coolant Leaks
Manufacturer Warranty*:
2 Year / Unlimited Mileage
2 Year / Unlimited Mileage
Instructions & Tech Info
Installation Info
Reviews For XDP XD344
Overall Rating
/5
3 Reviews
Rating Snapshot
3
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0
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Verified Buyer
Pain, but good quality
Preparedscouter (Texas) | January 2nd, 2026
2015 LML, had been barely leaking, I did with down pipe in, will RTV as well, watch ratcheting wrench on top one, busted knuckles on this one, pain but done.
Verified Buyer
Easy install
JohnLuke (Florida) | February 26th, 2025
Easy install and no more coolant issues
Verified Buyer
Coolant block off plate - order 1125917
Drew (Georgia) | April 28th, 2020
The original block off plate gasket blew out and was leaking pretty bad. It is a pain to remove with the down pipe in place but it is possible. Otherwise pull the passenger tire & inner fender. Be careful not to sandwich a ratchet wrench between the top bolt backing out and the down pipe. Clean the bell housing mating surface good with scotch brite.
No leaks since install, pleased so far.
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Specifications For XDP XD344
MPN
XD344
SKU
XD344
GTIN
856217008786
ID
60221
Manufacturer Name
XDP
Shipping Weight
1.00 lb.
Shipping Length
6 in.
Shipping Width
4 in.
Shipping Height
2 in.
Fuel Type
Diesel
Manufacturer Warranty*
2 Year / Unlimited Mileage
Prop 65
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
Cross Reference #
97941204, 97229043
Internal
L0R33
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