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Been trying to find more info on this, how safe is a new 05U block that has been bored and honed to 87.5? Making around 600Hp (flywheel) on a big single.
 

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87.5 is considered to be dangerous for cylinder walls as they are too thin for big power and prone to crack. So I guess 87mm is a max safe limit. Moreover, wider pistons are more prone to detonation.
 
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