I wasn't suggesting you should accept the cracks, just that they're not all that unusual, and they're probably fine for a stock motor.
If that's all that's wrong with the heads you might want to just look at getting them repaired and ported/polished while they're getting worked on. It might be cheaper than buying new 2.0 heads and result in better heads as well. Especially if you were to put some cams in them too.
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