filling holes with sound deadener

[leanburn]

  i installed a vintage air kit a couple years ago and as some of you may know this kit doesn't use the exsisting cowl vents, the kit comes with  plates to block off the holes under the dash. is there anything that i could fill the holes up under the dash ? i was thinking something like a dense insulation but i would think moisture would be a concern.

[slsc98]

  . . . ?

I'm considering vintage air for my '73 Challenger (non factory air, non-original 440 motor) and came across this thread / apparently unanswered request while initiating my search so wondered, any good answers / ideas?

[leanburn]

i didn't do anything yet but i saw a member on here who had pink house insulation stuffed in his trunk/1/4 panel area.  i would think this would work if you could get it tight but i'm not sure about the moisture. i want to fill every nook and cranny, in cowl, trunk, behind sail panels ect.

[Edison1970]

What size holes are you talking about?  Small holes can be filled with plastic plugs with some 5200 sealer.

[leanburn]

these are large spaces i'm refering.

[Travis72]

Which holes are you talking about? Do you mean the ones in the firewall?

Did you not want to use the plastic Vintage Air one?  If not you could always fab your own out of sheet metal.

Travis
72 Cuda

[leanburn]

I'm talking about filling that entire space with something for sound deadining.

[Travis72]

So you're asking if you should fill inside the cowl with sound deadener?  I wouldn't. That area needs to be able to drain water and I'd worry that anything you would put in there would trap moisture.  Just do the interior side of the cowl with sound deadener.  It only needs coverage on 1 side to be effective.  Here's what mine looked like:




Travis
72 Cuda