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TIR on 2007 and earlier Twinkie cranks is .002", from 2008 on it is .004". This is when still in the V-blocks used for trueing. In the crankcase the TIRs double, but now the crank is supported by roller bearings, which do move a bit. The TIR tightens up once again once the cam plate is in place, as it serves to support that end of the crank.
Where did you get your information on the bearing supplier change? And what makes Timken so special? I spec'd out a lot of roller and ball bearings over the course of my career. Timken ain't the only game in town, and not necessarily the best, either.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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