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Originally Posted by HummBebe
So if that is all they did, was bore, we will now have 10.5:1, 11:1??
Will they now have to step up in octane rating, or will the computer take care of it?
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Compression ratio is 10.3:1. so it went up .3 (current has a 10:1). You will not have to burn premium fuel, the computer is programmed to compensate.