Does anyone have a Demon skeleton laying around?

tom999w said
In the ideal world your info would work great, but in the real life, establishing the O-line on any 55 year old car is just a guess.

Nope. All the dimensions you need to establish the 0-line are clearly marked and it’s not a guess, the geometry is clear and repeatable.

tom999w said
This is because you can see from the factory diagram that the O-line IS the centerline of the wheels. So the manual doesn't specify, but I GUESS these dimensions from the wheel centerlines to the frame (which moves up and down in relation to the wheels) are based on a fully loaded car (engine, transmission, interior, etc.etc. etc.), because the car WILL move up or down depending on what type of weight is on the car. So that blows the O-line dims right out the window. Also, what type of front and rear shocks are we talking about, and torsion bar tensions?? All those will affect the dimensions from the O-line to the frame points on that diagram.

All completely irrelevant. I’ll say this again, all the dimensions needed to establish the 0-line are clearly marked in that diagram.

That’s a chassis diagram. None of those measurements are ride height dependent. There’s a reason the suspension isn’t drawn in, it isn’t relevant for the chassis measurements.

Yes, they indicate the axle centers for the wheelbase measurements in the drawings. They show them because the chassis measurements establish those locations, not the other way around.

tom999w said
So in the end, lets throw the dice on the imaginary O-line with movable dim distances, or throw the dice on taking three sticks and doing three simple vertical measurements. (Btw, if you lay a long stick on the roof, it doesn't wobble, it sits right sturdily on the roof as if you were laying it on a flat table).

View attachment 1716463387

None of the dimensions in that diagram are moveable. The chassis dimensions set the axle location, not the other way. There’s no “roll
of the dice” to locate the 0-line, just math. Basic geometry.

Clearly, you don’t understand how to use that chassis diagram. Or why your measurements are in fact useless for your intended purpose.

Best of luck.