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So, if I get a 68-up bh with the 4.8 center register, all I need is the 4.8 br for the 308 bearing, then no maching is necessary on anything, right? I'd still like to onw if it's possible to bore the 4.3 bh out far enough to fit the 5.1 br without getting into the fork pivot mount holes....anybody familiar with this? Thanks again guys.

yes, no machining needed. I don't have a 4.35 bellhousing to look at so I can't say for sure