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I was certain that the old liners were bored out... didn't want to steal Jack's thunder. CNC is nice, but it could be done conventionally as well, though with some greater variance. There have been other cars where the liners were a negative fit (block had to be heated and 'expanded' to accept them) and these also needed to be bored for replacement.
One question about porting the bottom of the liners though. I can see where it would work well on the 356 air-cooled motor, but aren't the cylinders on the M96 water-jacketed? I believe thay are. That in itself could pose more difficulty.
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