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^^x2 I've got several friends who've put together motors without the hardened seats. Nobody's burned or sunk a valve or any of that business. The motor on my Dartness is about to turn 10 (thousand) in a few months, and it's got '67 heads that I didn't even do a valve job to. No problems...

Don't run them. The metal there is there for a reason. Sure you can dress it up and make it work for a while, but eventually the piston skirts'll break in the engine, and you'll have to bore it over. Also, did you buy these new? or used? Because you don't damage a piston like that by...