Very strange smell. Stumped

[marek4792]

This one is a multi-layer metal gasket. Make sure the mounting surfaces aren't warped. Also when installing a new gasket cummins actually recommends using a high temp antiseize on the clamp itself in the v-bands, my guess its to make sure the clamp gets fully seated on what it is clamping together, also helps to tap the EGR valve a few times in each direction while tightening the clamp to properly seat everything.