[steve25]

So your box is out 1/16”
And your firewall the same 1/16” it would seem.

If you cant pound an outward bow into the firewall then you might take the time to make a thick iron bar stock reinforcement bar to span that gap area when the box is bolted on .

A 2” long length of 1/8” thick bar stock would be quite stiff.

Kinda the same idea as a valve cover load spreader bar.

It would not look stock if that might matter to you, but it might get you 1/16” closer to having no gap on top.

[gtobird]

Originally Posted by steve25

So your box is out 1/16”
And your firewall the same 1/16” it would seem.

If you cant pound an outward bow into the firewall then you might take the time to make a thick iron bar stock reinforcement bar to span that gap area when the box is bolted on .

A 2” long length 1/8” thick bar stock would be quite stiff.

Kinda the same idea as a valve cover load spreader bar.

It would not look stock if that might matter to you, but it might get you 1/16” closer to having no gap on top.

That's an interesting idea, but you are right, it wouldn't look stock. The gap is also in an area that is between the top left most mounting stud and the mounting screw above the fan so it would take a long support piece to make it work. I think what I'm going to try first is to take one of the blower housings and bend the flange so it would be flat when laid against the table. That will take up half of the gap and the remainder I will just let the rope caulk fill. I might even put some masking tape along the firewall and on the flange of the housing and then run a small bead of SEM black seam sealer in that area. I can remove the tape and it should be pretty much invisible. If nothing else, it will look cleaner than what GM did.