69 GM A body frame question

[SShep71]

Can anyone clarify which of the holes in the frame are the holes referenced on the sheet for the dimensions? I was doing some work last night and there was some discussion that the hole I was using for reference is NOT the hole that is shown on the sheet. I have a 5/8" diam bar through the set of holes that is being used, but not I am skeptical as the sketch is not specific.

[andrewb70]

Which dimension are you referring to exactly? There are two 5/8" holes that come up from the bottom of the frame and are used for body alignment.

Andrew

[SShep71]

The forward hole that is the datum reference for the body mount dimensions, the hole shown in this chart. Am I referencing the correct hole in the frame as I am showing in the first picture?177822

[raustinss]

Pretty sure it's the bigger hole yes

[SShep71]

Yes it's the bigger 3/4" hole, or yes it's the hole with the bar placed through it in the picture I took?

[raustinss]

Sorry the round hole that is circled ...in pencil ??? Lol

[SShep71]

That is the "problem" well...that is the debate. I was under the impression that the hole with the piece of bar stock through it is the reference hole, but a fellow "car enthusiast" has it that the large circled hole is the proper hole for reference. I really need to get this clarified, as it creates a rather large problem if I get it wrong.

[raustinss]

Set the frame on a flat surface , pick up the factory heights in other spots.. you'll figure it out real quick lol