IMO, always better to install a seat without breaking into water than repairing one that has broken through. But some rare heads, no choice, you have to try and save the casting. Recently put 8 sleeves in a 65 Hemi Block. What a complete mess. That thing should have been thrown in the scrap pile. But the owner needed to save the casting for some rare restoration. It will never be as good as a non-sleeved block. Cost a fortune to fix and still a marginal foundation for a once great engine. If you have a virgin-un-cut head, I would use it and install shallow seats. JMO.
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