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In Reply to: carbon deposit on valve and piston posted by Roger-Pierre Girard on Tuesday, October 20, 2009:
You can not assume that the rings are ok. the sleeves may be good but you could have stuck or worn oil rings in those cylinders. you could use MMO9 marvel mystery oil) in the cyclinders to try and free up the rings if they are stuck, ATF will be about the same so I am told.
I would at least use a straight edge and check the head to see if it is warped or not. If you have the head resurfaced, make sure the pistons do not hit the head, check with no gasket and no bolts. Be sure to retorque the head bolts or studs after running a bit.
I just used a scraper to get the deposits off, being careful to clean around the pistons real good. the MMO may help soften it also.
Good luck
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