Industrial Injection X-Series 44DB01 Upper without Head Gasket
Industrial Injection X-Series 44DB05 Lower
Industrial Injection X-Series 44DB01 Upper without Head Gasket
Industrial Injection X-Series 44DB05 Lower

2017-2023 6.6L Duramax L5P X-Series Gasket Sets

Industrial Injection SKU: 44DB01
Configuration
Price
Regular price $39895
Regular price Sale price $39895
Save $-398.95
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  • Free Ground shipping (Over $200*)
  • Top-of-the-line Customer Service
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Industrial Injection X-Series L5P Duramax Upper & Lower Engine Gasket Kits

Give your next diesel engine repair or rebuild a solid foundation with Industrial Injection X-Series Engine Gasket Kits.

Designed for engine rebuilds and resealing projects, these high-quality gasket kits help restore critical seals and prevent leaks. Tested and approved in-house by Industrial Injection, X-Series gaskets deliver sealing you can trust when it’s time to put your engine back together.

Whether you’re resealing the upper end, servicing the lower end, or tackling a full rebuild, these kits simplify parts sourcing and help you approach assembly with confidence.

Key Features

  • High-Quality Gaskets: Built for dependable sealing during engine rebuilds and resealing.
  • In-House Tested & Approved: Evaluated by Industrial Injection for quality and performance.
  • Leak Prevention: Help restore proper sealing at critical engine connections.
  • Convenient Kits: Reduce the hassle of sourcing individual gaskets for your repair.
  • Upper & Lower Options: Choose the kit that matches your engine and service needs.

Note: The Upper kit does not include head gaskets. Order the X-Series L5P Head Gaskets separately in the grade your engine needs. They are sold individually and the same gasket fits both sides, so order two for both heads.

Options & Part Numbers

  • Upper without Head Gasket — Part # 44DB01
  • Lower — Part # 44DB05

What's Included

Upper Gasket Set (44DB01) — 56 pieces

  • 1 × EGR Coolant Feed Pipe Seal
  • 1 × EGR Valve Gasket
  • 2 × Exhaust Manifold Gasket
  • 4 × Exhaust Turbocharger Inlet Pipe Gasket
  • 2 × Flywheel Housing To Engine Seal
  • 1 × Oil Filler Cap O-Ring
  • 2 × PCV Gasket
  • 1 × PCV Tube Gasket
  • 1 × Thermostat Bypass Pipe Gasket
  • 2 × Thermostat O-Ring
  • 1 × Throttle Body Mounting Gasket
  • 1 × Turbocharger Air Inlet Adapter Seal
  • 2 × Upper Intake Manifold Seal
  • 2 × Valve Cover Gasket
  • 32 × Valve Stem Oil Seal
  • 1 × O-Ring

Lower Gasket Set (44DB05) — 23 pieces

  • 1 × Crankshaft Front Main Seal
  • 1 × Crankshaft Rear Main Seal
  • 1 × Flywheel Housing Cover Gasket
  • 2 × Flywheel Housing To Engine Seal
  • 1 × Front Oil Pan Seal
  • 1 × Oil Cooler Adapter Gasket
  • 1 × Oil Cooler Elbow Gasket
  • 1 × Oil Cooler Gasket
  • 1 × Oil Cooler Inlet Gasket
  • 1 × Oil Cooler Outlet Gasket
  • 1 × Oil Cooler Seal
  • 1 × Oil Drain Plug
  • 1 × Oil Drain Plug Gasket
  • 1 × Oil Level Sensor O-Ring
  • 1 × Oil Pump O-Ring
  • 4 × O-Ring
  • 1 × Thermostat Bypass Pipe Gasket
  • 1 × Water Pump O-Ring
  • 1 × Water Pump Outlet Pipe Gasket

Fitment

  • 2017-2023 Chevrolet Silverado and GMC Sierra 2500HD / 3500HD with the L5P Duramax (VIN code Y)

Questions on fitment or which option you need? Contact Industrial Injection before ordering.
Shipping information

Free economy ground shipping on most orders over $200. This includes lower 48 United States only. Excludes products that must ship freight.

Core Return Info

Read Carefully!

When you purchase a product from our website that has a core requirement, you have two options:

1. You choose to pay the core charge and we will ship the product right away, then once we receive the cores you will be refunded the core charge if your cores pass our inspection qualifications. This is the preferred choice and has the least delays. 

2. You choose to send in your cores before we ship the product that was purchased. This choice has the risk of delayed shipment of your purchased product and our inventory is not guaranteed by the time we receive your cores. You will need to follow all of the instructions below as quickly as possible so that you can get your purchased product and we can receive the cores. When you choose this option you acknowledge that by the time we receive your cores, our inventory could have change and there could be a delay in your shipment. 

 

Please return all cores to:



Industrial Injection Core Returns
2858 South 300 West
Salt Lake City, Utah 84115

INCLUDE RA# THAT WAS ISSUED AT TIME OF PURCHASE! If RA # is lost, please call Customer Service at (800) 955-0476. Have your original invoice at time of phone call to give all appropriate information for return.

Core return freight is the responsibility of the customer

FULL CREDIT WILL BE GIVEN WHEN: 

In order to receive full core credit, your core(s) must be returned within 90 days from receipt of order. It must be as is “off the engine.” Full core credit will be given if core meets acceptance criteria. Cores that are damaged during shipment to Industrial Injection are the responsibility of the customer and their shipping company.

½ CORE CHARGE CREDIT WILL BE GIVEN WHEN:

  • Slightly damaged housing or camshaft
  • Missing parts such as FCA

No Core Credit issued when:

  • Core is seized or hydraulic head is cracked
  • Excessive damage ( Heavy use of Bio-diesel and rust are common causes for unacceptable core)
  • Core is fire damaged
  • Core is returned after 90 days/3months

Please do the following when returning a core:

  • Make sure you have removed all fittings from your old unit
  • Drain all fuel and oil from unit
  • Package cores so that fuel and oil does not escape from the package

NOTE: packages that have fuel or oil residue on the outside of the box during shipping will not be delivered by UPS or the postal service which will cause delays.

  • Please re-use boxes and bags that parts were shipped in originally. These boxes are UPS approved to reduce damage while being handled in freight.
  • All shipping charges are the responsibility of the customer
  • Please write on the box “Core Return” and have RA # clearly written on the outside of box
  • Include copy of original invoice and RGA inside box

PLEASE RETAIN RA#, INVOICE # AND TRACKING NUMBER UNTIL CREDIT IS RECEIVED BY YOU. We do not research by customer name, only invoice # or RA #.
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