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#1 |
Keep Your Nose Clean
Join Date: Dec 2006
Location: California
Posts: 496
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Firewall.....What are these holes for?
Greetings folks. I'm getting ready to fill in the firewall but don't have any idea what these holes are for and if they should be filled in. I'm running a carburated SBC mated to a 700R4, power brakes, and an aftermarket A/C. Thank you for any help you can provide. MisterE
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#2 |
Restoration Virgin!
Join Date: Jan 2008
Location: Huntersville, NC
Posts: 8,298
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Re: Firewall.....What are these holes for?
I couldn't find a pic that soemone did showing what all those holes are for, but I did my best to label some of them for you....what year is the cab??
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Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present Last edited by gcburdic; 07-30-2009 at 02:28 PM. |
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#3 | |
Keep Your Nose Clean
Join Date: Dec 2006
Location: California
Posts: 496
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Re: Firewall.....What are these holes for?
Quote:
![]() Last edited by MisterE72; 07-30-2009 at 03:28 PM. |
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#4 |
Restoration Virgin!
Join Date: Jan 2008
Location: Huntersville, NC
Posts: 8,298
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Re: Firewall.....What are these holes for?
Not sure what they are for....but I did remember in the 2nd photo the one I didn't mark is for the intermediate wiring harness that runs from the firewall to the rear cross sill for the rear tail light connections...sorry....i know someone will post up a pic of that firewall...I'll keep looking too!!!
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Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present |
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#5 |
Registered User
![]() Join Date: Feb 2009
Location: hot springs arkansas
Posts: 101
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Re: Firewall.....What are these holes for?
the two bigger holes in pic one are left hole if foe the cable from the heater controls it opens the flap on the outside heater box for the ac and the other is for the wires the go the the fan motor, graound on the fan motor and the other i believe goes the ac compressor but im not for sure i cant find it on a wiring diagram anywhere longhorn would probaly know hope this helps
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#6 |
Registered User
Join Date: Jun 2008
Location: South Florida
Posts: 11,375
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Re: Firewall.....What are these holes for?
Sr. E if you want a clean firewall only leave the holes I left, if you need to you can always redrill....
Small block Classic auto air Nothing else on the firewall but the harness...
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Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild |
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#7 |
Registered User
Join Date: Mar 2009
Location: North Texas
Posts: 440
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Re: Firewall.....What are these holes for?
Here's that drawing. The holes on the passenger side are for A/C control hoses and wires.
Last edited by Dynomutt; 07-30-2009 at 06:19 PM. |
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#8 |
Restoration Virgin!
Join Date: Jan 2008
Location: Huntersville, NC
Posts: 8,298
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Re: Firewall.....What are these holes for?
yep....that's the one I was talking about!!!....Thanks Dynamutt
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Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present |
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#9 |
Registered User
![]() Join Date: Jul 2007
Location: New River Arizona
Posts: 1,180
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Re: Firewall.....What are these holes for?
The holes in pic.1 are. Left hole Control cable fir the heater. The hole on the right is for the Vacuum lines to open the heat control valve and also the line going to the vac. Ball it also allows for a line back into the cab to feed the vac. switch on the ac. control.
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#10 |
Keep Your Nose Clean
Join Date: Dec 2006
Location: California
Posts: 496
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Re: Firewall.....What are these holes for?
Are most folks replacing the firewall insulator pad? I'd like to fill in the little fastner holes for that too. I imagine the insulator pad can be glued on using 3M contact cement instead of the fastners.
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#11 |
Restoration Virgin!
Join Date: Jan 2008
Location: Huntersville, NC
Posts: 8,298
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Re: Firewall.....What are these holes for?
Yep...you can fill those holes....just use dyna-mat, fat-mat, maybe lizard skin or whatvever you want to insulate the cab!!!
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Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present |
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#12 |
Keep Your Nose Clean
Join Date: Dec 2006
Location: California
Posts: 496
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Re: Firewall.....What are these holes for?
My neighbor Isaiah and I got started in it today. More to come later.
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#13 |
Registered User
Join Date: Feb 2011
Location: North Carolina
Posts: 993
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Re: Firewall.....What are these holes for?
Old thread, found using search! Haha how neat... thanks for everyone here btw!
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