An internal combustion engine includes a combustion chamber at least partially defined within a cylinder bore by a reciprocating piston having a piston crown. An intake plenum is fluidly connectable with the combustion chamber and at least one intake port is configured to fluidly connect the intake plenum with the combustion chamber. At least one intake valve is configured to selectively fluidly connect the intake plenum with the combustion chamber. The combustion chamber is configured to receive a lean air/fuel mixture therein to substantially fill the combustion chamber. The combustion chamber is further configured to receive a rich air/fuel mixture therein that yields a stratified total air/fuel mixture within the combustion chamber.