Had a couple questions here and on FB about the firewall insulation. The original stuff was falling apart after 27 years, and hitting it a bit with a pressure washer didn't do it any favors either. I went with
DEI Floor and Tunnel Shield II, that I sourced from Summit. Probably not the best stuff in the world, but it was pretty decent to work with, forms fairly easily, and is self adhesive. It's almost like a thin dimpled aluminum pie pan, bonded to a thin fiberglass insulation with an adhesive sheet on the back.
I used the old insulation as a general template as best I could...
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It cuts well with tin snips...
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A hole saw makes pretty clean circles, and a cut off wheel on a Dremel cuts the inside lines well enough. I later cleaned up the fuzz with scissors.
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The small drill holes are for the old insulation mounting studs, which I used for registration while forming to the firewall....
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Remove, trim, replace, form, repeat a few times until you are happy, then peel the backing and adhere. The adhesive is serious stuff, you need to be in place before it touches much.
...and done ! (Well, almost, seems I didn't get an actual finished picture) It isn't perfect, but it should do the job. It's mostly hidden anyway.
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In that pic I had not taped the driver side seam or above the heater lines yet. You can also see that I made a few changes to the cut outs on the last (drivers side) piece. Just a circle instead of the larger square cut out for the plug. Wish I had paid a little more attention and been less true to the original to begin with.
Jason