Ah, but you've never heard of anyone doing this because most just live with it! Or don't notice it! It's 'off', because that's the way GM made them, period. It's not because it was hit, not because the housing is damaged or some kind of defect, it's because that's the way it was designed.
Ask people who are squeezing the most tire under their' cars, what their' measurements are coming out as, and you'll see, EVERYONE has this issue with less room on the pass side. Or for that matter, look at factory collision repair specs, and it will show you it's off to one side.
Why do you think, as you stated, it's 'common' to find it 1/2" different? Because they are all like that. What kinds of minor adjustments have you heard of?
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1971 Lemans Sport 461 bottle fed daily driver
1971 Trans Am 474 blown EFI pro tour car
1972 442 W-30 clone
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