You should look into mikroniting...about 400 for a full gear set to be coated. Your parts will come back fairly shiney, the coating fills in the imperfections in the metal.
Let me know ill get you in contact with someone that can hook you up.
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The purpose of ignition advance is to account for the lag time following spark ignition for combustion pressure to peak at 15 degrees AFTER TOP DEAD CENTER. A little fyi  ! |
