Cummins ISC

The Cummins ISC Long Block (LB) is an 8.3L inline six-cylinder electronically controlled diesel engine designed to provide a dependable, cost-effective replacement solution for medium- and heavy-duty commercial applications. Built to Cummins specifications, the ISC Long Block delivers proven durability, strong low-end torque, and reliable performance while allowing many external components from the original engine to be reused. Its rugged design and long service life make it a trusted choice for demanding operating environments.

About This Cummins ISC

Common Equipment Powered by the Cummins ISC

The Cummins ISC is commonly found in Transit buses, fire trucks, dump trucks, mixers, motorhomes

Key Details

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Configurations

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Key Details

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Configurations

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The Smart Choice for Engines

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Built to Exact VIN/ESN

Every engine is remanufactured to your exact engine serial number — guaranteed fit, every time.

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Highly Rated

Trusted by fleet managers and owner-operators nationwide for quality and reliability.

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Free Shipping

Ground LTL and UPS freight included within the continental US — both ways.

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Price Match Guarantee

We match like-for-like price quotes from competitors. Quality at the best price.

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8-Hour Installation

Exact serial number match means your engine drops in and installs in about 8 hours.

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OEM-Quality Performance

Remanufactured engines deliver OEM performance at a fraction of new engine cost.

The Smart Way to Buy

From inquiry to installation — a straightforward process.


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Freight included,
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Frequently asked questions

How long will this engine last?

With proper maintenance, remanufactured engines routinely exceed 300,000 to 500,000 miles

What are common failure points?

Like most diesel engines, EGR and emissions components, injectors and turbo systems over time.

Is this enough power for my application?

If you're not hauling extreme loads daily, the ISL provides the best balance you'll feel mile for mile.

New vs Reman — what should I choose?

Remanufactured offers OEM-level quality, tested performance and the best value versus buying new.

Ready to Power What's Next?

Get the performance, reliability, and value you expect.

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Price match guarantee

Highest quality at competitive prices

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Free shipping

Ground LTL and UPS freight, continental U.S.

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8-hour installation

Built for fast, clean drop-in install

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100% dyno-tested

Every engine verified to factory specs

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Built for the real world

Medium-duty and vocational applications