2020-2022 3.0L Duramax Head Gasket Kit (26500)

Fits

3.0L LM2 Duramax Head Gasket Kit

Replacing a cylinder head, chasing a failed head gasket, or tearing into a top end service on the 3.0L LM2 Duramax? This kit gathers the OEM gaskets, seals, and torque-to-yield fasteners the job actually calls for into one box. Sourcing dozens of individual GM part numbers is slow and expensive, and a single missed one-time-use fastener puts the truck back on the hoist. Merchant Automotive assembled this kit around the components commonly required during cylinder head removal and installation, so the reseal goes back together correctly the first time.

Part Numbers: 26500

• Complete top end reseal solution for the 3.0L LM2 Duramax
• Genuine OEM gaskets, seals, and service components
• Includes the one-time-use fasteners required during cylinder head service
• Removes the guesswork of sourcing dozens of individual part numbers
• Reduces downtime and repeat parts orders on head gasket jobs
• Curated by Merchant Automotive for professional-quality repairs

• Cylinder head gasket and cylinder head bolts
• Glow plugs
• Camshaft cover gasket and camshaft sprocket bolts
• Crankshaft front seal and O-ring
• Intake and exhaust manifold gaskets
• Turbocharger gaskets, hardware, and oil feed/return seals
• EGR system gaskets and seals
• High-pressure fuel feed pipes
• Fuel injector seal and washer kit, plus injector hold-down bolts
• Lower timing cover gasket and timing chain tensioner gasket
• Oil filter, oil level indicator seal, and flex plate bolts
• A/C compressor and condenser hose seals
• Transmission cooler line O-ring seals
• Additional OEM seals, gaskets, and service components required during cylinder head removal and installation

Symptoms Of A Blown Duramax Head Gasket

A blown head gasket can sideline any diesel truck, but the engine can be brought back with the correct parts and an experienced hand. The most common symptoms include:

• White Smoke Coming From Tailpipe
• Unexplained Coolant Loss With No Visible Leaks
• Milky White Coloration Of The Oil
• Engine Overheating
• Coolant Bubbling In Radiator & Coolant Reservoir
• Coolant Streaks Near Gaskets

Why Do The Fasteners Have To Be Replaced?

Many of the fasteners removed during cylinder head service on the 3.0L Duramax are torque-to-yield, meaning they stretch permanently when torqued and cannot hold clamping load a second time. Reusing them risks an uneven seal and a repeat failure, so this kit includes the one-time-use hardware the procedure requires.