3965999FR | Cummins ISB 5.9L / 6.7L 24 Valve Fire Ring Cylinder Head | 5361595FR

Benefits of this Performance ISB Cylinder Head:

Brand New & Fully loaded Cummins ISB Cylinder head.  Our castings are engineered, designed, and assembled in the U.S.A. They are better than OEM quality containing 5% more nickel content in the casting material. This additional nickel content prevents the cylinder head from cracking in between the valves. Additionally, the coolant passages have been enlarged by 30%, and inner ribs have been reinforced to reduce heat stress. If you have been a victim before of a cracked cylinder head, you know just how costly that it can be! Don't take the chance by buying an OE reman cylinder head that is bound to crack again. Upgrade with our Enhanced Performance Cylinder head and enjoy the peace of mind while hauling across the country!

In addition to this, the cylinder head has a stainless steel fire ring machine right into the deck of this cylinder head to avoid any chance of blowing a head gasket, which is a common failure in engines that are tuned to higher horse power. This allows you to turn up the heat and pressure with the peace of mind knowing that you have the heaviest duty head on the market under your hood.

5.9 ISBE CYLINDER HEAD GASKET 3958645

6.7 ISBE CYLINDER HEAD GASKET 4932210

What is this Enhanced Performance all about?

This performance cylinder head is an upgrade from the standard cylinder head. On top of the interior upgrades to the actual casting itself, the intake valves in this cylinder head have all been upgraded to inconel valves. This major performance improvement increases the capacity of the valves to endure higher temperatures as well as heightened pressure. 

There is a common fracture issue with standard valves when they are running at heightened horse-power, this superior quality inconel material prevents these types of fractures and ensures that your exhaust valves can stand the heat! If you are looking to get more out of your engine and ensure that your head doesn't fall prey to corrosion, pitting, and cracking; this is the head for you!

Any mention of OEM names or OEM product ID numbers/descriptions/model numbers is intended for identification purposes only and does not indicate that it is an OEM part.

3954673, 3957384, 3957385, 3957386, 3957408, 3957958, 3957959, 3958170, 3965998, 3965999, 3968185, 3968186, 3969071, 3977222, 3977225, 3977226, 3977227, 3977228, 4895759, 4895765, 4931564, 4931645, 4933955, 4936081, 4955212, 4981626, 4981627, 5270036, 5282703, 5282721, 5361595RX

We offer FREE ground shipping to any commercial address in the Continental USA! To avoid residential fees, please provide a commercial/business address during checkout. If there is a residence on the property the LTL Carriers will assess additional fees. If you don't have a commercial address or shop to ship it to, please call us and we will help set up delivery to the nearest Freight Terminal so that you can pick it up once it arrives, free of charge. We have shipping locations spread across the United States, if you need this kit fast, call us and find the nearest location to you! 

The head is well packaged in a durable wooden crate and convenient nylon lifting straps for safe and secure shipping and handling. 100% Satisfaction Guaranteed. 

To make things even better, there is no core charge and no core return required!

Still not sure? Let your mind be at ease, this superior quality cylinder head is backed by a 1-year warranty.