Fix your truck right the first time and permanently solve your Duramax blown head gasket symptoms with the NorCal Diesel Performance (NCDP) Premium Head Gasket Master Bundle Kit. Engineered specifically for high-stress 2011-2016 6.6L LML Duramax engines, this customizable top-end rebuild kit gives you the flexibility to swap out failure-prone factory components with heavy-duty, shop-tested solutions while keeping your budget and vehicle reliability in mind.
At the core of this premium GMP Line kit are our proprietary NCDP Premium Grade C Multi-Layer Steel (MLS) Head Gaskets (1.05mm thickness). They deliver a bulletproof, high-pressure seal engineered to withstand hot tunes, heavy towing, and extreme cylinder pressures while providing crucial deck clearance for machined or remanufactured heads.
Don’t get locked into a rigid, one-size-fits-all kit. Our single-page modular builder lets you customize your LML top-end overhaul directly from the drop-down menus below to align with your specific budget and build goals.
Core Kit Components (Base Price)
The foundational setup includes your mandatory top-end sealing components alongside a choice of reliable fasteners—treated here as a straightforward brand preference rather than a forced "upgrade" tier:
- (2) NCDP Premium Grade C MLS Head Gaskets: Heavy-duty Left and Right side multi-layer steel head gaskets (1.05mm thickness) to ensure proper deck clearance on machined or remanufactured heads.
- (1) NCDP Top End Overhaul Gasket Set: A premium, comprehensive gasket setup that includes:
- Upper and lower valve cover gaskets and grommets
- Exhaust manifold and up-pipe gaskets
- EGR valve and cooler gaskets
- Intake bridge O-rings and coolant crossover gaskets
- Injector O-rings, valve seals, turbo drain seals, and more
- Your Choice of Fastener Brand: High-tensile fasteners are a must when replacing head gaskets to guarantee maximum clamping force.
- TrackTech Head Stud Set (Included in Base Price): Offers a massive upgrade in clamping force over factory torque-to-yield (TTY) bolts. They keep the heads firmly anchored on daily drivers and standard towing rigs without breaking the bank. We've run them for years with no issues.
- ARP 2000 Head Stud Set (Standard Cost Difference): The undisputed industry standard for high-performance diesel builds. Boasting an ultimate tensile strength of 220,000 PSI, these studs ensure zero cylinder head movement under hot tunes, upgraded turbos, or maximum commercial loads.
Real Tech Advice: Why These Add-Ons Keep You Out Of The Shop
Tearing down an LML Duramax to the bare block is a massive, labor-intensive job. Reassembling the engine with worn-out peripheral parts is asking for a repeat failure. Here is a straight-talking breakdown of how these optional additions solve real-world problems, protect your investment, and save you from massive secondary labor bills down the road.
Fuel System Overhaul: Injectors & Hard Lines
During a top end repair of an LML is the absolute best time to service your high-pressure fuel infrastructure. Swapping out worn common-rail components while the valve covers are already off saves you thousands in redundant shop labor bills down the road.
- Bosch OEM Reman Injectors (SKU: 0 986 435 410): The direct factory standard. Bosch was the original OE supplier for these trucks, and these remanufactured units are brought up to the latest tolerances and engineering updates to guarantee smooth, reliable factory performance. Perfect for keeping daily drivers and heavy tow rigs running like new.
- Dynomite Diesel (DDP) LML Performance Injectors (45% Over / 100HP): Built strictly for heavy-performance street builds pushing 750–800 RWHP. These are balanced, matched racing sets designed for trucks running modified or dual CP3 pumps, upgraded turbos, and custom tuning. Note: Due to high fueling rates, these are not recommended for frequent or heavy towing applications.
- NorCal Diesel Performance LML Injector Hard Line Kit: Critical Installation Advice: Never reuse your old, crusty lines. Over time, the internal walls scale up. When you retorque old lines, microscopic rust scale and metal flakes break loose, shooting straight into your brand-new injectors. This instantly ruins your new nozzles or sticks an injector wide open, risking a melted piston.
Cylinder Head Upgrades: The 150k-Mile Reality Check
Once an LML passes the 150,000-mile mark, those aluminum cylinder heads have seen thousands of harsh heat cycles, making them naturally prone to warping or developing micro-cracks around the valve seats.
- Fleece Performance Factory Replacement Cylinder Heads: FPE-61-10004-D, FPE-61-10004-P. Shaving old warped heads drops your overall deck thickness. Upgrading to fresh Fleece driver-side and passenger-side cylinder heads solves this permanently, giving your top-end overhaul a reliable, factory-fresh baseline.
Cooling System Essentials & Maintenance
If your old head gasket was puking coolant, residual sludge, combustion gas, and scale are likely sitting in your cooling stack right now. Give your rebuild a healthy start while everything is wide open.
- Water Pumps (Dmaxstore, XDP, Alliant): Fresh pumps prevent unexpected weep hole leaks right after you get the truck back together. Upgraded variants feature pinned or welded impellers to prevent the impeller from slipping on the shaft under heavy load.
- Mishimoto Thermostats: Factory thermostats get tired and stick over time. Choose Low-Temp ("DL") for hot climates or heavy towing to open the cooling circuit early, or High-Temp ("DH") for cold winter climates to ensure optimal engine operating temperatures.
- Radiators (Mishimoto, Dmaxstore, XDP): Replaces age-restricted factory plastic end tanks with high-flow aluminum cores that drop coolant temps and eliminate plastic thermal cracking risks.
- Lower Engine Gaskets & Fluids: Refreshing your lower engine gaskets, glow plugs, and fuel filters is cheap insurance. Dumping fresh engine oil and heavy-duty diesel coolant is mandatory—running cross-contaminated "chocolate milk" fluid will wipe out your main bearings in short order.
Build your kit today and get your truck running better than ever with this complete kit.
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