Chassis Dimensions and the BF-3 PDF

Hey All,

I hope someone can help me out, this is a rehash from another Z forum, but I'm spreading it in the hope of finding a solution.

I'm in the early stages of restoring a 71 240z and thought a chassis jog would make life easier. As of now, step one is creating headaches, as described below.

As of now i have built a chassis jig/frame and am in the process of bolting up my bent 240z to it. And here is the rub.

I spent countless hours pouring over the only chassis dimensions document out there. That being the BF-3 204z dimensions PDF.

As described previously I was thinking that the dimensions are wrong, or my car is very, very bent. With what I describe below, I don't think the car can possibly be 'that' bent.

Some framing of the problem, with a crap pun:

I have used four mounting points (described from rear to front):

(1) Rear diff mount (not mustachio bar), (4 lateral bolts)

(2) Front mount to the rear lower control arm, (4 lateral bolts)

(3) Transmission mount, and then (two lateral bolts)

(4) Front Strut Tower Top ("A" point).

The dimensions (that don't work):

(1) Reference point.

(2) 465mm from ref. (1). this one is 15mm to short. (closer to 480mm)

(3) 1427.5mm from ref. (1). This one lines up.

(4) 2381.3mm from ref. (1). This one is 20mm to short. (closer to 2401.3mm)

To my point......what the heck is going on here??!!

Between point ref 1 and 2 my car is 480mm. In the BF-3 document, there is no reference to a 480mm dimension.... The car cannot be warped by 15mm, it's all structural mounting points. So, what am I missing?

Moving on to the dimension between 1 and 4. Again, too short by 15 to 20mm... So, what is the actual dimension?

All of the lateral dimensions are correct.

I scratch my head. It's great though as it gives me something to talk with my wife about over dinner.

Thank you in advance!