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Old 06-29-2025, 07:30 AM   #10
Bored&Stroked
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Join Date: Jan 2011
Location: Central Ohio
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Default Re: 21A rods set up on a 4" Merc crank

Thanks Ronnie . . . as usual, we tend to be on the same flathead page.

As I mentioned to Hank in a DM, it is not a bad idea to open up the big-end of the rod about .001 or so . . . to achieve a bit more oil clearance. This is probably more important with the hard copper type bearings, than with the Cad-Silver ones (where it is easier to "polish away" some bearing material with ScotchBrite).

When using a rod hone, you have to make sure that the final operation highly polishes the big-end bore . . . and it is a bearing surface. You do not want a cross-hatch like on a normal insert bearing rod.
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