When I took this picture in 1969, the do-not-wash-or-oil decal was already gone. However, you can see the outline of where it had been - on the driver's side maybe a little more than halfway between dead forward and dead to the left.
My guess is these decals were applied pretty sloppily, and there is no one precisely correct spot for that decal, on 273s or any other motors of that era.
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