Detroit Series 60 12.7L Cylinder Head w/ Inconel Valves | P/N 23525566

The Momentum Worx Detroit Series 60 12.7L Cylinder Head (23525566) is the premium solution for restoring reliability and performance to your Detroit Diesel engine. Designed for the legendary 12.7L Series 60, this complete cylinder head features high-temperature Inconel exhaust valves for superior durability under heavy load, high EGTs, and performance applications.

Unlike standard replacement heads, this version is equipped with Inconel valves, a premium nickel-chromium alloy that offers exceptional resistance to heat, corrosion, and valve fatigue. Whether you're running a hard-working fleet truck, heavy haul application, or a performance build, Inconel valves provide increased reliability where conventional valves often become a weak point.

Every cylinder head is manufactured to meet or exceed OEM specifications for proper fitment, sealing, and long service life.

Why Choose the Momentum Worx 23525566 Cylinder Head?

• Premium replacement for Detroit Diesel Series 60 12.7L engines
• Upgraded with Inconel exhaust valves
• Built for improved durability in high-temperature applications
• Precision-machined for OEM fit and performance
• Excellent choice for stock, heavy-duty, and performance engines
• Ready to install with factory-style fitment
• Backed by the customer service and technical support of Momentum Worx

Why Inconel Valves Matter

Engine heat is one of the biggest enemies of valve life. In heavy-duty diesel engines that spend long hours pulling loads or producing increased horsepower, exhaust valve temperatures can become extreme.

The Inconel exhaust valves included in this cylinder head offer:

• Greater resistance to heat fatigue
• Improved resistance to valve burning
• Increased strength at elevated temperatures
• Longer service life than conventional steel valves
• Ideal for performance, towing, and commercial applications

If you're investing in a new cylinder head, upgrading to Inconel valves helps provide additional protection for one of the hottest areas inside your engine.

Fits

• Detroit Diesel Series 60 12.7L Engines

Trusted Heavy-Duty Diesel Parts from Momentum Worx

When truck owners, owner-operators, repair shops, and fleets need dependable diesel engine components, they turn to Momentum Worx. We specialize in premium heavy-duty truck parts backed by knowledgeable support, fast shipping, and real-world diesel experience.

From cylinder heads and injectors to turbochargers, exhaust manifolds, and installation hardware, Momentum Worx has become a trusted online source for Detroit Diesel, Cummins, and Caterpillar engine parts.

Order with confidence knowing you're buying from a company that understands heavy-duty diesel engines—not just another online parts warehouse.

OEM & Industry Cross Reference

This cylinder head replaces or crosses with the following part numbers:

23523294
23525566
23525566B
23525566VS
23525567
23526844
660005
660005X
8929620
8929620MG
8929872
DCWN23525566VS
DDE23525566
DDER23525566
HDT23525566
HDT23525566VS
N23525566VS
R23525566
D-S60HEAD
DS60HEAD
HBRN23525566VS
MCB23525566

***Ships Flat Rate Via Pallet - any other items added to your cart at checkout will allow you to choose expedited air shipping, this will NOT apply to the cylinder head.