Technical Stepping Model A frame

So here I am, ready to cut my Model A frame a la Vern Tardel. On page 28 of the famous book by Bishop & Tardel it says "Mark the frame 4 inches from the forward face of the rear cross member. This isn't an arbitrary dimension; if the cut for the step is made 1/4 or 1/2 inch further forward, lots of otherwise unnecessary bodywork will be required." Now turning to the picture of their frame on page 32, the subscript for the picture again calls for 4 inches. But the picture shows the cut is made about 5 inches from the rear face of the rear cross member.
Plan to mount a Brookville roadster body, same as the book. Where do I cut???

 

Go to Walden Speed Shops Instagram page and scroll down. About a month and a half ago he showed their procedure for doing what you are planning. There are 2 series of photos showing their procedure. Also check Iron Trap Garage.

 

Just went out and measured mine, it's 4" from the forward face of the crossmember.

 

Thanks guys. 4" it is.