Reinforce Your Cummins ISX Engine with this Cylinder Block Stiffener Plate. When Cummins transitioned from a dual-cam to a single-cam system in the ISX engine, they also lightened the cylinder block. Unfortunately, this design change has led to recurring issues with liner instability and blown head gaskets, costly problems that impact reliability and performance.
Cylinder Block stiffeners are a proven solution in many engines by adding structural reinforcement to minimize flex and improve engine reliability and longevity.
✔ Reduces Cylinder Block Flex – Helps maintain liner stability and prevents premature wear.
✔ Prevents Head Gasket Failures – Keeps components aligned under high loads and extreme conditions.
✔ Proven Performance – Engineered, tested, and verified to work
Stop dealing with premature failures. This Cylinder Block Stiffener Plate is the upgrade your engine needs to handle heavy loads, high mileage, and extreme conditions.
The Cylinder block stiffener Install Kit includes: Permatex Anaerobic Gasket Maker, Permatex Gasket Maker, and the fasteners needed.
A new standard oil pan gasket is not included but will be required upon installation.
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If you have an earlier ISX engine (pre-single cam), this stiffener plate can still provide added structural support and help stabilize the block. While older ISX engines weren’t affected as severely by block flex, reinforcing them can still improve longevity and reduce stress on internal components—especially under heavy loads.
 
Maximize Success with Stainless Steel Shims
For the best results, we recommend pairing our block stiffener plate with stainless steel shims. These shims provide additional liner support, helping to:
                Reduce liner movement, further preventing head gasket failures.
                Ensure a precise liner height, improving overall engine performance.
                Increase durability, preventing wear and distortion over time.