These a are 1939 Nash rods with oil fed wrist pins, and side squirt holes. Straight 8
Do you plan to x groove the Hercules or Nash rods?
No, they are all oil pressure fed.
Interesting that you are not oil grooving them Herm, considering that the wrist pin and bore/cam oil holes are supplied by the bigend bearing.
The factory already had there design, as I duplicate it.
It is a narrow rod bearing and pressure, so any grooves would not be productive.
With the crank spinning, the pressure in the squirt hole, and the feed pipe to the wrist pin bushing would not be broken.
If you are talking Factory design! then one of us is way of track.
The way I read it, the 8 cyl Nash was insert bearings.
I found all the specs on the 8 cyl Nash, 1930/42 also that they produce 115HP at 3400RPM. Some time back when researching early plane engines, problems with poured bearings was in that rev range, 10% silver was added to tin babbitt, wider bearings and 4 bolts, with some success but eventually a re-think and bronze bushing then roller bearings solved problems of the flogged out babbitt. I,ve seen a International engine have babbitt poured to replace the shells many years ago as new bearings couldn't be found, it did work for several months.