Coolant Bypass Kits are designed to re-route some coolant flow which helps lower coolant temperatures at the rear of the engine for consistent temperatures across all cylinders. In a performance application, this can cause excessive pressure to build in the cooling system, causing the external freeze plugs or the small diameter plugs under the valve cover to fail. A common issue in some diesel engines, the rear cylinders on a straight-six configuration experience the highest coolant temperatures due to a lack of coolant flow at the rear of the head. Shop now and find Fleece Performance, Full Send Diesel, and many others to keep your cooling system operating properly.
