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Something else to consider besides the possible overheating problem is ring seal. On tall deck blocks like the FE, the cylinder has alot of height that is unsupported. This is why drag racers like to fill the block with a concrete like material. To support the cylinder wall. Whenever your objective is to create horsepower, ring seal is very important.
So, there is always a trade-off to overboring more than would be required for the average rebuild.
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