The King hp are great, and they are 1/2 groove. For 30 years I ran full groove, even made my own jig for full grooving oversize bearings. Always seemed to be getting a rod bearing within 50-75 runs. Last build 5 years ago my machinist guy who builds T/D and T/S monster motors suggested getting away from full groove. I thought what I'm doing isn't holding up, lets try it. Now this was a 4.75 stroke cut .030/.020 with 2.200 rod journals. The motor lived without incident until it dropped a valve after 200 plus runs. The bearings were still excellent. No more full grooves for me. Sometimes you have to get out of the box. I run 10-40 royal purple with the Milodon swinger, and sometimes the pressure would go to zero under hard braking. The bearings showed NO signs of distress. I put a stop in the pan to keep the PU from going all the way forward. I spoke to the guy that designed them years ago, and he sez they suck. I think he's right, but I'm still running it.
RIP