5658294 | Cummins ISX15 Stage 4 Single Overhead Cam Loaded Cylinder Head | N4298234FR

Benefits of this Performance ISX SOHC (Single Overhead Camshaft) Cylinder Head:

Brand New & Fully loaded Cummins ISX & ISX15 Single Overhead Camshaft 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!

What is this Stage 4 all about?

This cylinder head is the top-shelf item for your Cummins ISX/ISX15 Engine. This super duty cylinder head, similar to the stage 2 and 3 heads, is loaded with exhaust AND intake upgraded inconel valves. This major performance improvement increases the capacity of the valves to endure higher temperatures as well as heightened pressure. 

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.

We also include and enhanced head gasket that is meant to be used with this fire ringed head at no additional cost!

Tighten the cylinder head bolts following the steps below

   3.3.1) Tighten the bolts numbered 1 thru 26 sequentially to    a torque of 50 ft-lb

   3.3.2) Tighten the bolts numbered 1 thru 26 sequentially to a torque of 150 ft-lb

   3.3.3) Wait 5 minutes to allow for settling

   3.3.4) Tighten the bolts numbered 1 thru 26 sequentially to a torque of 300 ft-lb

   3.3.5) Wait 5 minutes to allow for settling

   3.3.6) Tighten the bolts numbered 1 thru 26 sequentially an additional 120 degrees.

3.3.8) After head installation in complete, start engine and let the coolant temperature stabilized, then run engine to 80% RPM for 10 minutes. Now loose all head bolts 120 degrees.

3.3.9) Now follow steps 3.3.3 thru 3.3.6 again 

3.3.10) Retorque the bolts numbered 1 thru 26 sequentially, to 330 ft-lb after the 1000-mile break-in period.

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.

3686432, 3686434, 3686660, 3686660, 3686774, 3686880, 3686881, 3687607, 3688761, 3688800, 4298235, 4298236, 4298237, 4298237, 4298238, 4356434, 4386009, 5394197, 5394198, 79438920, 79457900, 79469386, 79527893, 79575425, 4374091

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!