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Steady state emissions testing on a dynamometer with an 11-liter heavy-duty engine have shown the ability to obtain tail pipe oxides of nitrogen (NOx) emissions of 0.15 g/bhp and below. Equivalence ratios of 0.53 have been achieved over the operating range. The development of a dedicated hydrogen-enriched natural gas (HCNG) engine utilizes a mechanical means to extend the lean limit of combustion through a quiescent intake path. Hydrogen blend ratios of 30-40% have been employed. Current manufactured natural gas heavy-duty engines use intake swirl as a means of extending the lean limit of combustion for reducing NOx emissions. These engines have shown reductions in NOx emissions with HCNG and lean burn however, are unable to meet 2007 goals. Principals at Collier Technologies, Inc (CTI) have been developing and operating HCNG engines for the past eleven years with dramatic results in NOx and CO emissions.