Boring

No somewhat the opposite, as 0,5 is pretty much the limit where it's almost better to hone as you could only bore another 0,4mm (have to leave some for the honing finish) making good chances that the boring bar will not get enough cutting feed to go through the glazed surface and thus the cut might be somewhat flimsy.
At just 0,5mm missing it's almost better to hone the remainder as the hone has a tendency if applied correctly to even out differences in parallelism and diameter.

Kind regards

Christian

The guy I was talking to mentioned the difficulty of boring that amount.

Perhaps tooling has changed/improved, but "back-in-the day" hones (Sunnen, Aamco, etc.) were good for final sizing and finishing; perhaps removing .05mm or so. Boring bars (carbide bits) would need several passes to remove 0.5mm. (2 oversizes). I wouldn't think the hones - that I'm familiar with - would be well suited to remove .5mm and get a round, straight bore.

If that local shop says it can hone .5mm, I'd want to see the equipment. If it's handheld (even diamond stoned), I'd decline.

Hmmm, interesting. I'll check it out but I'm pretty sure he was not talking about a handheld hone.
 
So I have yet another option to consider. Instead of boring that set of cylinders from 77.5 mm to 78 mm and using the Cruzinimage pistons I was thinking about boring another set of cylinder I have to fit the used JE's I have as long as they check out OK, I think they are.
 
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