Cummins CPL Long Block Lookup
Enter your engine's CPL (Critical Parts List) number below to find the exact new-aftermarket long block for your application.
4B, 4BT, & 4BTA 3.9L
6B, 6BT, 6BTA 5.9L
This tool will help you look up long blocks for the most common CPLs. However, it doesn't cover every possible configuration of B-series long block. If what you're looking for doesn't show up, please don't hesitate to give us a call at 800-828-6943 with your engine serial number as we can still typically supply you with the correct long block for your application..
