6.6L Duramax Billet Coolant Block Off Plate (2001-2025) Apparel Only active when boost over

Only active when boost over 15psi

5 inch (105 percent greater flow area) Stock: 2

S372 SXE Billet 500-750 horsepower (Hot street/ racing)

For 12V Engines Only (for 1998

Threaded holes that are cleaned and free of debris are crucial in providing accurate torque readings during your engine build or head gasket repair

6.6L Duramax Billet Coolant Block Off Plate (2001-2025) Apparel Only active when boost overUpgrade your rear engine cover and stop the coolant leaks for good! The fleece performance blocking plate 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 and 12698239