SMX Aftercooler Core for Cummins 6B & QSB 5.9 Series Engine

Fits all aftercoolers for 6BTA/QSB 5.9 engines with the original style (pre-2021) aftercoolers.

Does not fit Mota Aftercoolers: WHICH AFTERCOOLER DO YOU HAVE? CLICK HERE

Includes O-Ring Kit & Tube of Metalube Grease

Made to Seaboard Specifications:

Core length has been specifically shortened 0.030”
to increase overall “Core Float” distance which
allows housings to be re-surfaced in cases of heavy corrosion.

Made in the U.K. NOT in CHINA

Heavy Duty Construction & Materials

Cummins OEM B Core = 11.7 lbs. VS. SMX Core = 13.6 lbs.
Improved Endplate Materials to DZR Brass to resist Corrosion & Pitting
Constructed with Heavy Duty CuNi Tubes