40-2090665 Intake/Exhaust manifold gasket, Hercules model G1600 engine. Original part number was 40-209061740 2090665 Intake Exhaust manifold gasket used on the 1600 series Hercules engines, Gas types. Old part number was 40 2090617 and has been superseded to the above new number This will be item number 1 in the Hercules drawing. This engine was used used in numerous lines of forklifts and generators including DMT, Caterpillar, Clark, Komatsu and Daewoo.