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Jim, did you have to clearance your bearings?

Some will definitely be better than others, the first one after a sandpaper change would be alot better than the last .

No. Both of my low deck blocks are machined for 440 mains with the aluminum main caps. The cranks are RB 4.250" (Current motor Callies, backup 440Source), and I am using MS-1277HG bearings.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1