This is Stage 2 in our Performance Line of cylinder heads. Installed with Inconel exhaust valves, it can withstand extreme temperatures and pressure generated engines.
This Stage 2 cylinder head also has some major improvements over the original OEM casting. It was crafted to create better coolant flow for more efficient heat transfer and contains higher nickel content for longer-lasting strength and durability.
How A Cylinder Head Failure Happens In Your Diesel Engine
Failure starts with compression in your cooling system:

Having compression in your cooling system leads to loss of coolant or overheating. This could result in your cylinder head cracking! It’s best to recognize these issues right away so you can save time and profits.
Read our blog What Caused a Crack in My Diesel Engine Cylinder Head for more information.

What are the benefits of Inconel Exhaust Valves?
- Inconel material is stronger and more durable than stainless steel
- Tolerates extreme heat and temperature fluctuations
- Maintains structural integrity under high pressure and stress
- Resists corrosion, oxidation, pitting, and cracking
- Reduces the possibility of chordal fracturing
Why Buy From HHP?
- At HHP, we don’t sell inferior cylinder heads from discount suppliers. We only sell you the best quality cylinder heads for your needs, at fair, affordable prices. We are so confident in what we sell, that we offer an industry-leading warranty of 12 months.
- Our ASE Certified Techs can diagnose your engine problem, offer you a fast and accurate estimate, and provide expert repair and installation advice, so you can make a confident purchasing decision. That’s why we’re America’s trusted diesel engine parts supplier.
- We know that you need to get parts fast to service your customers. That’s why we at HHP make sure that we have readily available lubrication system parts for your specific diesel engine and can typically ship your parts the same day.
Related Articles:
CYLINDER HEAD FAILURE ANALYSIS: WHY IS MY HEAD CRACKED?
HOW TO INSTALL A DIESEL ENGINE CYLINDER HEAD
WHAT GOES INTO A REMANUFACTURED CYLINDER HEAD FROM HHP?
SIGNS YOU NEED TO REPLACE YOUR CYLINDER HEAD
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Short on Time? Take your Quote Online!
We get it- when you need Diesel Engine Parts, time is of the essence. That’s why we’ve developed the HHP Online Quoting System.
FAQs for the C15/3406E Cylinder Heads with Inconel Valves
1. What makes the Stage 2 cylinder head for my Caterpillar engine different from the OEM casting?
The Stage 2 cylinder head is crafted for better coolant flow, more efficient heat transfer, and increased durability. It has a higher nickel content and features Inconel exhaust valves for withstanding extreme temperatures and pressure.
2. What are the benefits of using Inconel exhaust valves in the Stage 2 cylinder head?
Inconel exhaust valves are stronger and more durable than stainless steel, tolerate extreme heat and temperature fluctuations, and maintain structural integrity under high pressure. They also resist corrosion, oxidation, and cracking.
3. How does compression in the diesel engine cooling system lead to cylinder head failure?
Compression in the cooling system can cause coolant loss or overheating, which may result in the cylinder head cracking. It’s crucial to recognize this issue early to avoid expensive repairs.
4. What signs should I look for to know if my diesel engine’s cylinder head is cracked?
Signs of a cracked cylinder head include coolant loss, overheating, and poor engine performance. If you notice these issues, it’s important to address them immediately to prevent further damage.
5. What warranty comes with the Stage 2 cylinder head for my Caterpillar engine from Highway and Heavy Parts?
The Stage 2 cylinder head is backed by a 12-month warranty, ensuring quality, performance, and peace of mind for your engine repairs.






