100% Genuine SMX Aftercooler Core for Cummins QSC 8.3 Series Engine (3974302, 3966698)

These cores are built to OEM specifications or better and are manufactured in the USA.

The Early Style, 3974302, 3966698 aftercooler core fits ALL original style (non-MOTA) QSC aftercooler housings and uses a (3) O-Ring design. Aftercoolers of the later design used longer cores and included a spacer ring that uses a (4) O-Ring design. Call if you have questions.

See the product description below to determine which version you have and what parts will be required.

Aftercooler Core: REV 2-12 = PN 3966698, REV 13-15 = PN 3974302