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You missed my point that not even Hardinge Special accuracy collets run with zero runout, bit more runout with their standard ones Agree a collet will not distort like say a 3 jaw would.
Well as the recess in he piston is 3/8" wide, little end also 3/8" wide and similar for the big end and crank you would have a rather tight engine if one or more of the liners was out by 0.5mm as there is not enough clearance.
This is the Major not the Seal.. Yes you should not have the top of the con-rod a tight fit in the bottom of the piston or the bottom end a tight fit on the crank But it would not make any difference if the 12.7mm wide little end was 1mm narrower Jo
More features one of the Seal valve guides/seats has a pit on it I don't think it will prevent the valve sealing but it is concerning
You can't tell us about red devils and then not show us
P.S. I will accept castings in exchange for it
So Red Devil just showed up on your doorstep?? Bill