Roll pins work well, especially under 6k rpm. Some rebuilders with lots of experience with 557 blocks use extended solid dowel pins, they do a better job of keeping the caps situated without inducing too much stress on the main webs. The real trick is to make sure the holes for the dowel pins are the right size to accommodate solid ones. If they press in too tight, then they add stress at that location and increase the chance of cracking the block.
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