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Should I cover firewall holes?
#1381155 Sat Oct 17 2020 02:06 PM
Joined: Oct 2000
Posts: 226
B
Shop Shark
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?

Re: Should I cover firewall holes?
buckaroo01 #1381160 Sat Oct 17 2020 02:12 PM
Joined: Sep 2001
Posts: 30,455
ace skiver
I have left the holes as they are, and, I have put plugs in the holes [google.com]. A hardware store might have an assortment of plugs.

Maybe even in gray/grey, black, chomed, stainless-steel?


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Should I cover firewall holes?
buckaroo01 #1381266 Sun Oct 18 2020 01:12 PM
Joined: Mar 2014
Posts: 1,657
J
Shop Shark
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
Re: Should I cover firewall holes?
buckaroo01 #1381388 Mon Oct 19 2020 02:00 PM
Joined: Oct 2000
Posts: 226
B
Shop Shark
Thanks for the info, I’ll check out the local hardware store

Re: Should I cover firewall holes?
buckaroo01 #1381463 Tue Oct 20 2020 01:21 AM
Joined: Mar 2010
Posts: 9,443
5
Master Gabster
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.

Re: Should I cover firewall holes?
buckaroo01 #1381470 Tue Oct 20 2020 01:55 AM
Joined: Sep 2001
Posts: 30,455
ace skiver
thumbs_up


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]

Moderated by  ndkid275 

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