Not Ranked
shaps,
To help put this into perspective; 0.030 inch would mean that 0.015 comes off the cylinder wall at any one point if the bore is done correctly. The paper in the printer at your computer is between 0.003 and 0.005 inch thick, thus the cylinder wall will be about the thickness of four sheets of paper thinner after the boreing process. If the process was done correctly (the cylinder bore followed the original centerline of the cylinder) the change in strength of the cylinder wall is minimal.
I would guess that after the 30 years that this block has been out of production there are more 427 engines out there at 0.030 over bore than at standard bore.
Keith
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