King Bearings are available with oversized thrust. I measured the crank end-play of my 400 at .008" with new FM bearings and .004" with King. King states on their site that this is a feature of their bearings, to compensate for some thrust wear.
67 GTO, 428, Q-Jet, TH400, 3.42, 12.50/107.5, whisper quiet
67 GTO, 400, Q-Jet, M20, 3.23, 14.02/98.7, loud & obnoxious
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