Good bore geometry improves ring sealing to maximize power while minimizing blowby, compression losses, emissions and oil consumption. Most engine builders know that if you don't bore and hone the block with a torque plate that creates a simulated load, the hole won't stay perfectly round. As soon as the head is installed and bolted down, the head bolts will pull the bore out of round, which could affect the sealing ability of the rings between the bore wall. And this is especially true in performance engines that are eking out every bit of power through thin, low tension rings.
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