Hi. ive got half sized quarters ( they stop at the nice long arc that these cars have above the rear wheels)to go on my 67. where would a good place be to trim and weld them on as far as the upper seam well have to make? The body man im working with thinks a small lap joint about 3/4" from the top of the arc/upper quarter would be a good place, that way only a bit of poly would be needed to hide the seam(from the top edge/corner of the original metal feathered to the new metal). Im sure this would work but i just wanted a second oppinion from others who might have done the same. thanks,Dave

That would work but another suggestion (although tougher) is to make the seam just below or pratically on the body line. I've had this done on two projects where the seam weld is practically the body line itself. The advantage is there is more metal at the body line and is less apt to heat and distort. If you choose to overlap at another location, a continuous seam weld is much more difficult.

I don't think a continuous seam weld would be possible that didn't cause distortion with that thickness of sheet metal. On patch panels from professional body shops, I've seen patch panels put in with spot welds every 1 1/2" and bondo used to fill in the rest of the joint. If you did want to weld the whole seam, then I'd recommend spot welding end-to-end, but jumping across the patch everytime you do a spot weld so that too much heat is avoided. I recently put in a floor pan with the end-to-end spot welds for a butt joint. There was less discoloration than a continuous bead and also there was less heat distortion.

I would make a but joint about 1" below the seam so that I could feather the body filler up to the seam.

Thanks guys. Im sure it will work out well in the end. I had to replace the inners too, the car looked real good when i bought it, about 3 years ago. After digging into the body, it needed quarters and inners wells, patches in the front window channel and lower cowl work (above the drivers feet area). Im now an expert at drilling spot welds LOL. I guess life for a car is not as easy in BC than further south!!

You will want to weld the whole seam. You don't weld it all at one you weld about an inch than move down the panel to a cool spot, and jumparound till the seam is welded. I too like to stay near sharp bodt lines if possible to avoid warping.
Austin