One item to remember about the early Winton Engines, as well as the early 567 engines from EMC, they were ALWAYS mounted in an enclosed carbody such as a "Doodle Bug", "shovel nose", or "E Type" unit. Thus, it was pretty desirable to keep the temperatures of the top deck reasonably cool so as NOT to bake the lube oil flowing through and out of the overhead camshafts and associated valve train "jewelry". The exhaust manifolds were hot enough as it was, so there wasn't any reason to add to that terrific heat by NOT water cooling the top deck area.
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