Buick Nailhead Engines
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How the dipstick is inserted will affect how it is aligned with the oil sump tube. 

Note the picture below shows the dipstick over the top of the oil sump tube.
Buick Nailhead Dipstick With Oil Pickup Tube

Note the picture below shows the dipstick underneath the oil sump tube.
Nailhead Oil Pickup and Tube

Note that whether the dipstick goes above or below the oil sump tube
will show a much different oil level reading on the dipstick.