I measured the piston skirts at 64.01mm
Service Limit is 63.815mm
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I am just working out what parts I need. Measured the ring end gaps.
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Older (second ring marked with an "O") top 0.031" sec 0.05" easy

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Newer (no markings on rings) top 0.029" sec 0.048"

Noticed oil ring variation.

So it is looking like I have 2 worn pistons and worn out ring sets, with both cast iron bores holding up well.


Happy is he who penetrates the mystery of things.