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Failure mode - GM 6.0L V8 Gasoline (GM HD, LY6-L96 2008-2019; Express/Savana vans 2008-2020)

Exhaust manifold cracks / bolt failures (Vortec-era carryover)

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

Symptoms

Compare with the other causes of the same sign on this engine: ticking, knocking, rattle or whine (4 causes)

Root cause

Thermal cycling and corrosion break or stretch manifold bolts and crack flanges at mileage - the same theme the Vortec 8.1/6.0 records document; leaks read as a cold-start tick and exhaust smell in the bay.

Diagnosis

Fixes

renew the manifold/gasket set with fresh bolts as required ()

Prevalence

occasional

Affected configurations (100)