Dream Duramax: 2003 GMC Sierra 2500

A Compound-Turbo GMC Built Right— The Second Time AroundAndrew Murdoch thought he paid a reputable shop to turn his ’03 GMC Sierra into a high-horsepower monster. What he got instead was a horrible mess. When an incorrectly ported cylinder head cracked and allowed coolant to flow into the combustion chamber, his brand-new (and expensive) built motor was ruined. Diagnosing the Duramax’s failure was a nightmare because almost every sealing surface on the drivetrain leaked. The transfer case was the only exception—but that was because nobody had ever refilled it with ATF.


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