Now that the head is off, I scraped the small amount of carbon off the piston tops with a plastic scraper leaving a discolored but smooth surface that I lightly oiled. Question - should I clean off the remaining film with either fine emery cloth or something else that does not leave scratches - or just let well enough alone and let it be? I've seen some pistons that look like new after a valve job.
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smilie in place of the real @
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