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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Oct 2000 Posts: 244 'Bolter | | 'Bolter Joined: Oct 2000 Posts: 244 | I have a 1953 GMC and before I put in a sound deadening mat should I cover the small holes in the firewall to the engine compartment or does it make a big difference? | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | I have left the holes as they are, and, I have put plugs in the holes. A hardware store might have an assortment of plugs. Maybe even in gray/grey, black, chomed, stainless-steel? | | | | | Joined: Mar 2014 Posts: 4,501 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,501 | Some of those holes were used for the clips which hold in the internal firewall insulation pad. When I did this, I reused that pad and simply applied it over the top of the sound deadening stuff. Those holes that weren't needed I covered with plugs just like Tim did. I got them at TruValue hardware store in their Hillman parts section and think I may have paid $4 for all of them. The ones I got were black plastic.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
| | | | | Joined: Oct 2000 Posts: 244 'Bolter | | 'Bolter Joined: Oct 2000 Posts: 244 | Thanks for the info, I’ll check out the local hardware store | | | | | Joined: Mar 2010 Posts: 10,282 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,282 | The unused holes were originally covered from the inside by a sound deadening mat which was glued on. You can do the same thing with your sound deadening mat.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | |
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