5.9L 12V Cummins Long Blocks (1989–1998)

Shop by Brand

View all Brands

If you are rebuilding a first-generation Dodge Ram or need a dependable replacement for a worn 12-valve engine, our 5.9L 12V Cummins long blocks for 1989-1998 trucks offer a strong balance of value, reliability, and installation convenience. A long block is a great option when you want more than a short block and need a more complete engine foundation that includes the cylinder head and valvetrain components. For many customers, that means less parts transfer, less machine shop guesswork, and a more efficient path back to the road.

Compared to a short block, a 5.9 Cummins long block gives you a more complete assembly for stock replacement, towing builds, work trucks, restorations, and performance-minded projects. It is often the smart choice when your top-end components are worn, damaged, or no longer worth reusing. Whether you are freshening up a tired original engine, building a dependable tow rig, or putting together a clean 12V swap, CPP Diesel helps simplify the process with quality Cummins engine options and real diesel experience.

Shop our 1989-1998 5.9L 12V Cummins long blocks below and choose the configuration that fits your project. If you need a lower-cost bottom-end solution, be sure to compare our 5.9L 12V Cummins short blocks. If you are looking for more complete replacement options across multiple generations, also explore our reman Cummins engine options to find the right setup for your truck, build goals, and budget.

What Comes In A 5.9 Cummins Long Block?

A 5.9 Cummins long block typically includes the engine block, crankshaft, pistons, bearings, cylinder head, and valvetrain components, professionally assembled and ready for the next stage of installation. This gives you a more complete engine package than a short block, while still allowing flexibility on accessories, fuel system components, manifolds, turbocharger selection, and other external parts. For many builds, a long block offers the right middle ground between cost savings and installation simplicity.

Long Block Vs Short Block Cummins Engines

A long block includes the bottom end of the engine along with the cylinder head and valvetrain, while a short block includes only the lower-end rotating assembly such as the block, crankshaft, pistons, and bearings. If your head and valvetrain are worn, damaged, or questionable, a long block is usually the better option because it reduces parts transfer and gives you a more complete starting point. If your top-end components are still in good condition and you want to keep costs down, a short block may be the better choice.

Need help choosing the right Cummins long block for your build? Call CPP Diesel for expert guidance before you buy.

5.9 Cummins Long Block FAQ

What is included in a 12-valve Cummins long block?
A 12-valve Cummins long block generally includes the block, crankshaft, pistons, bearings, cylinder head, and valvetrain components. It gives you a more complete engine assembly than a short block while still allowing you to transfer or upgrade external components.

Is a 5.9L 12V long block a good option for stock replacement?
Yes. A long block is an excellent choice for stock replacement builds when you want a dependable engine foundation with less assembly work than a short block. It is commonly used in daily drivers, tow rigs, restorations, and work trucks.

Why choose a long block instead of a short block?
A long block makes sense when your cylinder head or valvetrain components are worn, damaged, or not worth reusing. It saves time during the build process and reduces the number of parts you need to source separately.

Can I use a 12-valve long block for a swap project?
Yes. The 5.9L 12V Cummins long block is a popular choice for swap builds because of its durability, simplicity, and strong aftermarket support. It provides a solid base for custom truck and repower projects.

Do I still need external parts with a long block?
Yes. A long block is more complete than a short block, but you will still need to install external components such as fuel system parts, manifolds, turbocharger components, front accessories, and other supporting hardware depending on your application.

Are these long blocks inspected before shipping?
Yes. Each long block should be checked for proper assembly, cleanliness, and build accuracy before shipment so you can move forward with more confidence in your installation.

Quick view

CPP LONG BLOCK 5.9 CUMMINS ENGINE 89-98

MSRP:

Was:

Now: $4,495.00

Choose Options Compare

Quick view

CPP LONG BLOCK 5.9 CUMMINS ENGINE 89-98
5.9 Cummins Premium Reman Long Block The CPP Diesel Long Block Crate Engine 1989-1998 Cummins 5.9L 12V is the ultimate choice for those seeking unmatched performance and durability. With exceptional features and precise design, this 12 valve Cummins...

MSRP:

Was:

Now: $4,495.00
Choose Options Compare

Compare Selected