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By circulating coolant between cylinders 5 and 6
replaces stock or a shimmed pressure relief valve
* The controller's high speed
This conical design offers enhanced stability for moderate cams and OEM-size valves
2006-2010 Duramax LBZ/LMM Main Stud Kit (230-5402) 2011-2019 Ford Engine Components By circulating coolant between cylinders2006 2010 Duramax LBZ LMM Main Stud Kit (230 5402) Upgrade your 2006 2010 GM 6. 6L Duramax LBZ LMM with an ARP Diesel Main Stud Kit 230 5402 from XDP. Whether you are setting up your Chevy GMC diesel for drag racing, sled pulling, or just looking to upgrade the power levels, ARP main and head studs are a must have item! Keep your mains from walking and fretting by clamping down on them with a ARP Main Studs that will protect your investment!