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This set is a direct upgrade to the factory lines on your 2001-2004 Duramax LB7
2 LOW UNLOC CHEVY '01-'14 2500-3500 4WD / '01-'13 1500 4WD
Required for first time replacement of injectors for engines with a serial numbers less then 56462598
79% increase in holding power
Duramax Rocker Bridges 2001-2016 6
Fleece Coolant Bypass Kit for 2003-2018 Cummins Manual Transmission & 2007.5 to present Non EGR Equipped Injectors 2010-2012 Cummins 6.7L This set is a directIncreased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 5. 9 6. 7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. Our coolant bypass kit adds a secondary
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