I would have thought they would swap the entire longblock rather than pay the dealership for tranferring the heads over to the new block. Souldn't be a big deal or anything. As long as the engine was never starved of oil, your heads should be fine and past their break in.
You should be able to go hard on the motor from day one to seat the rings and prevent this from happening again.
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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z
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