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I think the oiling diagram may yield some cluse to the rod bearing issues. This version is not that easy to read, but it would appear that the oil is pumped to the rear of the engine first, through the filter and to the #1 rod bearing/main journal last.
IIRC, Pascal's law dictaes that all points in a pressurized system will see the same pressure, but that doesn't take oil starvation, out of round main saddles, etc., into account.
The theory that the #1 cylinder works harder than the others is inaccurate. If all cylinders have equal compression and similar fuel delivery, all will impart the same amount of force to the crankshaft. The position of #1 at the front of the engine doesn't make it any more of less susceptible to damage by reason of it 'seeing more load' than any other cylinder.
However, if it is the last to receive oil, then a reduction in volume could create an issue. My 617.950 never drops below 30 psi...ever...Robert
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