This sounds plausible. An imbalanced crank, or a scored bearing. Could have gotten some foreign particles into the pan and made its way into a bearing.
Disassemble the block when you get it out, and let us know!
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-SamP, BSME-
~1998 Mustang GT~ - Saleen Body Kit, Cobra R wheels (17x10.5 w/ 315/35 in rear and 17x8 w/ 245/45 out front), 3.27 gears, FMS C Springs. . . Waiting for income tax check to do 99PI headswap!
RateMyStang
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