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I reckon the loss of oil is down to glazed bores. When I bought The Blue Flame from Martin B a few years ago it was very low mileage and had only covered 1800 miles in ten years. From what Martin told me it would appear that the car had basically covered those 1800 miles on the choke. I've never seen more polished bores in my life. It used to use a litre of oil a week easily. I took the head off, gave it a good honing, new rings and ends and it never used a drop of oil after that.
The failure of your number 4 bearing is nothing more than oil starvation, caused by all the oil getting burned off. If you think of how the OHV oil supply system is laid-out then number 4 big end is furthest away from the pump as the feed to the rear main bearing - and thus the 4th big end - has its feed reduced by the take-off for the rocker oil supply.
If you had made the journey at night you would have seen the trail of oilsmoke in the headlights of the car behind.
Is it wise to fit the rocker feed kit? I;ve toyed with the idea of fitting one to mine if and when they come up on sale again at Rimmers.