Were they replaced during the rebuild?
Good question that I can't be sure but I believe he did replace all the bearings.
It was in fact his car for 4 years and totally stripped it. He owns a classic car restore garage. He tends to rebuild his own cars also. He sold me the 33 because he wanted a 155 larger car.
He's a bit on the obese side. I can't believe he fitted in the 33.
But I have a doubt. Why would worn crank bearings have an effect?
I thought the pump revolutions are in relation to the engine revs.
If you're at 3000 rpm, worn or not, how would the pump have less pressure?
OK just answered my own question:
What Determines Oil Pressure?
At lower engine speeds, oil pressure is limited by the clearances between the various bearings and journals. For example, as the space between the crankshaft bearing journals and its bearings increases through wear, oil pressure will be lower because oil can flow out of the space more easily. The same is true for the journals on the big ends of the connecting rods. Thus, everything else being equal, low oil pressure can indicate worn bearings.
Now to what extent would I hear a knocking due to worn bearings? I don't hear this. Maybe just a slightly worn pump. But at high revs I'm getting a good pressure.