Hi Ole,
I completely agree that the trajectory of the oil stream is critical. At higher speeds the dippers need to get oil from the steam from the nozzles. The action of the dippers in the troughs is so great due to speed that it almost leaves a channel or groove in the oil.
As always Gene is correct about the rocker arm oiling for the 235’s. That change to taking oil from the rear cam bearing was often a point of trouble. The oil had to pass around the rear rocker arm stand bolt. That small passage often would plug (sort of like the oil flow to the timing gears on a 216). Even with a bypass oil filter the lack of detergent oil allowed the sludge to form.
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