The prewar Graham engine internals differ slightly from that of the postwar 226. From '37 thru '41, the engine varied from 199 to 216 cubic inches and as a result, most parts do not interchange. I know Chrysler used a water distribution tube that today haunts owners because they rot and cause alot of blockage. I am not aware of Graham using a tube and a quick look thru one of my Graham parts books didn't reveal one there either.