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They're called deck plates.

A similar process is being used currently on other types of engines. They are called deck plates. This was the original way to get a 351W to almost 450cid's. The block is bored to accept sleeves, then they put the deck plate on (with water passages and oil returns), then they insert the new sleeves that match up to the new deck height. It can be done to a modular, but why? This process would cost nearly $5K, plus you could only step up to a 5.4 deck height. Any higher or lower would add to the cost by requiring you to also have new timing chains made.

Besides, there have been rumors of an aluminum 5.4 block to be available to the public in the not-so distant future.
 
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