4SPEED427 wrote:

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Oh man, what have I done.........

Are you happy now Dan?

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 I know this is an old thread but it seems logical to add to it rather than start new.

For years we have known that GM always used a torch of some sort to cut this hole in the floor on the assembly line on the B bodies that came with a 4 speed. 

Not too long ago I bought a factory hump from Howmac in preparation of doing the 4 speed conversion on my Grande Parisienne this winter. What I got from him was the hump that had been cut out with part of the surrounding floor still attached, so it included the area cut out just like in the above picture. Yesterday I decided to remove the factory hump from the larger piece of floor that was cut out around the hump.  When I was removing the hump, I noticed the factory hole cut in the floor. This one is definitely a factory cutout as evidenced by the seam sealer, the attaching bolts, the spot welds etc but look at the lines of the cut. They are clearly NOT done with a torch. I've seen many of these cuts but this one was done with some sort of mechanical cutter, not a torch. 

Again I've learned to never say never. No more saying that GM never used anything but a torch to cut out the floor hole.