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Message: [QUOTE="Rich Rohrich, post: 714619, member: 16241"] Excessive heat in the piston crown is the usual cause of the black carbon under the dome. The cracked head could easily cause overheating issues and excessive heat in the crown area. If you run the crown hot enough for extended periods of time it will tend to collapse the upper ring land and seize the ring in the groove. Even if the cooling system isn't malfunctioning too hot a plug, excessive caron buildup on the crown or overly advanced ignition timing can cause preignition and have these same types of piston crown heat issues, with the same end results. If you measure the ring land area on your piston and compare it to a new one you should be able to get an idea of this is the cause of your ring sticking problem. [/QUOTE]