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Factory bore tolerance stamps
Pulled down a few engines recently that looked to be pretty original.
On the decks were stamped letters near each bore, possibly designating tolerance post hone?. S, T etc. Does anyone have any information on these tolerance stamps, if they are indeed that. Stamping looks pretty uniform, so may have been machine probed, then stamped, and assembly guy picked a corresponding piston to suit to try and close up tolerance?
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