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this is just a small threadjacking
pic of sleevs at 89mm bore on my 2.7
the cylinder walls are no issue, I have almost 5000 miles on this, 2k from driving to the dragon, and on pump gas.
Also, he is in Cali, thus 91 octane. The highest CR you can run on that safely is 12 something and his old set up was 13:1. He has got to be running 14+..