Do you want oil pressure to your rods full time or not? I do , I use the ruck narrow full groove main bearings, not the wide full groove race bearings
Oil does two things in our motors, lubricate and cool, I like cool cranks
Are those the same as the MS-1277HG Clevite 77's?
I can't answer that sorry. I use to use the Seal Power part number M4500 for the RB motors and their M4400 for the B motors, I think they discontinued the M 4400 several years back I prefer to build the 400 blocks over the 440 blocks due to the thicker main webbing
Ok, I get ya. I think they are the same bearing. I have a '78 440 and I think it is similar to the 400's in that respect.
, I use the ruck narrow full groove main bearings, not the wide full groove race bearings 
