PROJECT: How would a Chevrolet dealer build a shop truck in the early 1970s?

[mattfranklin]

None of the bores show over 0.002 wear.
About half showed less than 0.001 wear.

Method: set inside micrometer for 4.032 (and later 4.031) and tried tipping it and jiggling inside the bore to see if I could make it change directions. At 4.032 I couldn't make it tip in any of the cylinders no matter how I tried. At 4.031 if I tried really hard I could make it tip in about half of the cylinders near the top of the bore.