I used some two bolt steel caps that BCR fabbed up many years ago. We had to elongate the bolt holes on a couple of them as they "missed" but our builder felt other than the inconvienience of straightening that out (at our cost of course...), no harm no foul. Bearings always looked good on the mains. think I'm using them for paper weights now that we've gone the R3 route. This was with our 4" stroke 340 that ran a best of 9.87 @ 138. There was alot more in it, but our W5 "issues" kept forcing us to r/r the engine more than we anticipated.