Well, around Wisconsin they should be 40” deep. That doesn’t mean they went that far as some try to cut corners.
The addition I just redid they had green treated 4x4 sunk 16” or so on top of concrete footings that went to around 36” deep
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71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.
‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
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