What still worries me is the fact that - based on all your comments - I haven’t found the root cause for my failing bigend.
What i had in was: 1) VH - steel crank, all the oilways were free, it was an old one but got a new cage and repaired
2) 1938 timing cover with the pressure regulator fitted, this was fully screwed in
3) new Morgo pump with the green (later) gasket
4) I had no pressure reading on the gauge but when opening the nuts at the rockers, oil came ( sufficient), as the return worked fine.
my crank became noisy and used up within 10 miles!
I have now fitted an other VH crank, which I had in stock, my concern is now - what to change / check in order not to have the bigend failing within shortly again.
It could also be possible that the first crank was not repaired properly, and that the oiling system had worked fine, but at least I want to make sure that the oiling system works now!
Thank you in advance for your support in my tricky situation !