Sale

Engines and Components› Engines, Blocks and Components

Cummins

4BT 3.9L Long Block Assembly

$5,999.99 $362.99 Save $5,637.00

SKU: 230828

In Stock
In Stock
Ships by Jul 29
Free Shipping
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Description

The Cummins 4BT 3.9L Long Block Assembly is a premium replacement solution designed for Cummins applications. Featuring the 230828 block casting and 3933352 head casting, this long block assembly is engineered for performance, reliability, and durability. This brand-new long block provides the foundation for efficient and dependable operation in heavy equipment, machinery, or vehicles powered by Cummins engines.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandCummins
Part Number230828
CategoryEngines and Components

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy