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This is one of those topics that are quite controversial with no clear answer.
One side believes the factory break-in procedures are valid and follow them (I'm in that camp)
Another side will cite MANY engine builders that are on the side of 'run it like you stole it' right from the beginning and the rings will seat much better. They build race engines all day long and aside from a short cam break-in period, the hammer it forever.
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