Rods finally came.

There is a fixture in the cam tunnel and mounted to the top of the block. The boring tool is in a fixed position and cannot walk. You my friend do not know what you are talking about. Watch the video. You may learn something . My son does lifter bore truing in Pa.
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I see, it looks like the reamer is piloted off a fixture bar in the cam. Can you upgrade a block to a bigger diameter lifter?