It wouldn't take much of a detective to figure out that something major had been done to the engine. With a little looking around for scratches on fenders/firewall and other accidental damage, a good mechanic could probably make a good guess as to what was done. But, as Plasmite said, most dealers/mechanics aren't going to look that close and probably don't care if they do notice - unless the damage is consistent with abuse or modifying. Ie, if you go in for routine maintenance or a minor repair, it shouldn't be a problem. If you have bent rods, they're probably gonna notice.
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