Very interesting Tony. I wonder if it has anything to do with being a military block, which would be going through Army workshops. Or is this standard practice for all new blocks purchased bare? I've only ever fitted rebored blocks, and they've always been finished to spec. The only time I've used a hone is for ring jobs, to deglaze the bores and remove the lip. Afterwards I check the piston clearance to make sure it's still acceptable.
It's quite good fun I think you'll find, although if you have an old block it would be worth practicing on, to get the 60 degree pattern Lynn mentioned. Look forward to more pics as the job proceeds.
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One of the original Australian CMP hunters.
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