Boring the block for +.060” oversize pistons will increase the compression ratio. You’re now compressing a greater cylinder volume into the same size combustion chamber, thereby raising the compression ratio.
If the engine was 10.75:1 to begin with it will now be around 10.9:1. The factory rating was optimistic in most every instance, so you’re more likely somewhere around 10.25:1 in actuality.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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