An engine overspeed system, comprising: an engine having at least one combustion chamber defined by a cylinder, a piston operable to reciprocate within the cylinder, and at least one intake valve and at least one exhaust valve associated with the cylinder, the engine having an engine cycle comprising an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke; an engine overspeed suppression mechanism configured to move the exhaust valve between a valve open position in which gases may enter and/or exit from the combustion chamber and a closed position in which gases are inhibited from entering and/or exiting the combustion chamber, and, further configured to move the intake valve between a valve open position in which gases may enter and/or exit from the combustion chamber and a closed position in which gases are inhibited from entering and/or exiting the combustion chamber; and at least one control component being in communication with the engine overspeed suppression mechanism, the at least one control component configured to cause the engine overspeed suppression mechanism to: move the exhaust valve to the open position during the intake stroke, move the intake valve from the open position to the closed position near below dead center, BDC, of the intake stroke; and move the exhaust valve to the open position during a second stage of the compression stroke; wherein the intake valve is closed during the compression stroke. an engine having at least one combustion chamber defined by a cylinder, a piston operable to reciprocate within the cylinder, and at least one intake valve and at least one exhaust valve associated with the cylinder, the engine having an engine cycle comprising an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke; an engine overspeed suppression mechanism configured to move the exhaust valve between a valve open position in which gases may enter and/or exit from the combustion chamber and a closed position in which gases are inhibited from entering and/or exiting the combustion chamber, and, further configured to move the intake valve between a valve open position in which gases may enter and/or exit from the combustion chamber and a closed position in which gases are inhibited from entering and/or exiting the combustion chamber; and at least one control component being in communication with the engine overspeed suppression mechanism, the at least one control component configured to cause the engine overspeed suppression mechanism to: move the exhaust valve to the open position during the intake stroke, move the intake valve from the open position to the closed position near below dead center, BDC, of the intake stroke; and move the exhaust valve to the open position during a second stage of the compression stroke; wherein the intake valve is closed during the compression stroke. move the exhaust valve to the open position during the intake stroke, move the intake valve from the open position to the closed position near below dead center, BDC, of the intake stroke; and move the exhaust valve to the open position during a second stage of the compression stroke; wherein the intake valve is closed during the compression stroke.