01-17 Duramax Fleece Coolant Block Off Plate Shirts 6L DURAMAX: Stock Tow: +50HP

6L DURAMAX: Stock Tow: +50HP Performance: +75HP Extreme: +120HP

and weak factory 2-piece design

Level 4: +125HP

Durable 5 mm thick silicone is twice as thick as the factory hose to ensure long-lasting performance

this series is backed with an industry leading 3 year warranty

01-17 Duramax Fleece Coolant Block Off Plate Shirts 6L DURAMAX: Stock Tow: +50HPUpgrade your rear engine cover and stop the coolant leaks for good! Fleece's blocking plate for 2001 2017 GM Duramax diesels is thicker than the stock plate and has an integral square cut O ring with no gasket required. OE covers are prone to leakage over time, our billet coolant block off plate with an integral O ring is an upgrade for your rear engine cover and will the stop the coolant leaks for good. Direct Replacement for GM P N: 97941204 Fleece