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Failure mode - Cummins 6.7L ISB Diesel (Ram HD, 2019+ generation)

Head gasket failure on tuned 2019+ 6.7

Reliability tier: verified - verify before ordering, see /disclosure/

Symptoms

Compare with the other causes of the same sign on this engine: losing coolant (2 causes)

Root cause

Stock clamping holds at stock output; raised boost/EGT on tuned trucks without head-stud preload lifts the head. Same standard as every Cummins generation: studs with the new gasket.

Diagnosis

Fixes

head gasket set with head studs (community-standard upgrade), deck check at machining ()

Prevalence

common

Affected configurations (40)