Holes in the firewall

Wade Mahaffey · 10-29-2019, 10:58 PM

In traditional S/S, can you weld up ... or fiberglass in the holes in the firewall from the heater box, wiper motor, and/or other misc. holes? Thanks

Wade Mahaffey

GTX JOHN · 10-30-2019, 04:48 AM

I Know welding or Aluminum patches work....
I do not know about fiberglass.

Tom Goldman · 10-30-2019, 01:00 PM

Wade , the rules regarding fiberglass bodies usually state similar material particularly in regards to floor or wheel tubs.
I assume this is on your C1 build.
I would see no problem with glass for closing it up . especially the inlet hole .

cmracing · 10-30-2019, 05:12 PM

I am GLAD someone is actually thinking of NOT leaving the holes there. A firewall is just that, a FIREWALL! I can't believe the amount of cars I have worked on that had holes in the firewalls and floors! Carpet sure ain't gonna stop those flames!

I would prefer metal, but if it is a fiberglass car like a 'Vette, then may as well stick with 'glass though sheet metal would be easier, would not look as nice if you know how to work that itchy stuff!

I have a friend that had a hole maybe the size of a half dollar and he could not believe the amount of fire that came into the car one time, he learned!

Wade Mahaffey · 10-30-2019, 10:27 PM

Thanks for the returns fellas, I have these areas sealed up with fiberglass and nicely finished ... ready for paint. You won't be able to tell where the holes used to be. It's not a molded firewall like a show car, but it is filled holes with the same material as produced ... like a nice car. I was just wondering if it was an issue with tech where you had to use a metal plate to cover any holes (not being familiar with S/S rules). I do have some experience with the fact that it is a fiberglass car, and officials are quick to say use steel here and there. And that there are not a whole lot of these C-1 cars in traditional Super/Stock (SS/LA). Todays tech folks don't have a lot experience with these old fiberglass cars (they may know these cars as modified cars but not traditional super/stock) and that can result in a hasty decision. Just trying to put my best foot forward and avoid conflict that's all

Wade Mahaffey

10-29-2019, 10:58 PM	#1
Wade Mahaffey Senior Member Join Date: Apr 2007 Posts: 581 Likes: 0 Liked 17 Times in 7 Posts	Holes in the firewall In traditional S/S, can you weld up ... or fiberglass in the holes in the firewall from the heater box, wiper motor, and/or other misc. holes? Thanks Wade Mahaffey Last edited by Wade Mahaffey; 10-29-2019 at 11:07 PM.

10-30-2019, 04:48 AM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,708 Likes: 2,734 Liked 2,399 Times in 679 Posts	Re: Holes in the firewall I Know welding or Aluminum patches work.... I do not know about fiberglass. __________________ John Irving 741 Stock 741 Super Stock

10-30-2019, 01:00 PM	#3
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,468 Likes: 874 Liked 838 Times in 232 Posts	Re: Holes in the firewall Wade , the rules regarding fiberglass bodies usually state similar material particularly in regards to floor or wheel tubs. I assume this is on your C1 build. I would see no problem with glass for closing it up . especially the inlet hole . __________________ Tom Goldman 1500 SG , 1506 STK

10-30-2019, 05:12 PM	#4
cmracing Member Join Date: Aug 2016 Posts: 173 Likes: 113 Liked 62 Times in 29 Posts	Re: Holes in the firewall I am GLAD someone is actually thinking of NOT leaving the holes there. A firewall is just that, a FIREWALL! I can't believe the amount of cars I have worked on that had holes in the firewalls and floors! Carpet sure ain't gonna stop those flames! I would prefer metal, but if it is a fiberglass car like a 'Vette, then may as well stick with 'glass though sheet metal would be easier, would not look as nice if you know how to work that itchy stuff! I have a friend that had a hole maybe the size of a half dollar and he could not believe the amount of fire that came into the car one time, he learned!

10-30-2019, 10:27 PM	#5
Wade Mahaffey Senior Member Join Date: Apr 2007 Posts: 581 Likes: 0 Liked 17 Times in 7 Posts	Re: Holes in the firewall Thanks for the returns fellas, I have these areas sealed up with fiberglass and nicely finished ... ready for paint. You won't be able to tell where the holes used to be. It's not a molded firewall like a show car, but it is filled holes with the same material as produced ... like a nice car. I was just wondering if it was an issue with tech where you had to use a metal plate to cover any holes (not being familiar with S/S rules). I do have some experience with the fact that it is a fiberglass car, and officials are quick to say use steel here and there. And that there are not a whole lot of these C-1 cars in traditional Super/Stock (SS/LA). Todays tech folks don't have a lot experience with these old fiberglass cars (they may know these cars as modified cars but not traditional super/stock) and that can result in a hasty decision. Just trying to put my best foot forward and avoid conflict that's all Wade Mahaffey