What are all these holes for? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1971Stepside** · 03-17-2003, 10:27 AM

Here is a pic of the firewall and it has been so long since I pulled this truck apart I don't remember what all the holes are for on the firewall. Here is a pic. I know the brake, column, fuse block, speedo holes, but thought this picture might help others as well.

jtnixon · 03-17-2003, 10:39 AM

Clutch linkage, throttle cable, e-brake, oil pressure line, wires to rear of truck

dubie · 03-17-2003, 10:41 AM

This is what mine looks like
Hope this helps

Slammed67 · 03-17-2003, 10:44 AM

What holes? Hmmmmm?..... I must have a different year cab

**1971Stepside** · 03-17-2003, 10:50 AM

Thanks Dubie that helps a lot.

Slammed...that is what I am trying to do to mine, but didn't want to cover up something too important.

**1971Stepside** · 03-17-2003, 11:08 AM

The few smaller holes are for screws and those rubber plugs for holding the mat in place on the inner firewall. Let me know if these are wrong. I had to do this in paint so it kinda messed with the colors.

Tennman · 03-17-2003, 01:12 PM

This is the reason i luv this place !!!!!!!! Way to go other there guys !! I'm inpressed !!!!!

KEH · 03-17-2003, 01:40 PM

That's great. I'm in the process of putting mine back together too, and it's great to have pics & diagrams to look at. Now, can somebody show me where everything else goes!

barn9 · 03-17-2003, 01:43 PM

You got it Tennman! This is what it's all about!

DarkFox1 · 03-17-2003, 09:46 PM

wow 71stepside, you've been busy! I haven't gotten a single thing done to my truck since I put it on the wheels. I just recently sold a 72 project truck to what sounds like a good future. A local man bought it to restore for his youngest son to drive

exactly the future that great truck deserves.

Lookin good man, at this point I oculnd't tell you on the holes either lol

Blue Beard · 03-17-2003, 09:52 PM

I have the same problem when I tear something apart. Takes time to get back too.

Since I use a Digital Camera alot anyway, I started using it as I work on something. Before, during, and reassembly. Saved my bacon many times.

Use it when working on my bike as well.

Nice work guys..............

72MARIO · 03-17-2003, 10:43 PM

There is one hole in the center of the fire wall for the heater I would not fill it in I think you need it for the Vintage Air kit too.I routed my washer hoses form the inside of the cab and through fire wall and into the cowel I dont know how to explain it though..
The other holes are for the insulation plugs. And one more there are two screw holes on either side of the steering coloum they are for a seal from the steering coloum to the firewall. I am going to weld studs in thoes holes the length of the original screws the put a nut on the inside.

Slammed67 · 03-17-2003, 11:36 PM

Isn't the hole labeled "trans linkage" actualy for the clutch rod? Or is that what you meant?

OhioDan · 03-18-2003, 06:36 AM

The hole labled "Trans linkage" is where my accelerator pedal linkage is. Just my $.02

**1971Stepside** · 03-18-2003, 10:58 AM

Yes, that is what I meant by trans linkage...should be relabled I guess to clutch linkage.

This is a 71 cab and the holes and cabs do vary a little bit on the firewall I have found. Lost Wages' 68 cab has a few different holes so keep that in mind.

72BBGMC · 03-18-2003, 01:56 PM

you have the hole for the oil pressure line marked wiring, second hole above the throttle cable hole.

hobby67stepside · 03-18-2003, 02:30 PM

I don't seem to have many holes either!

Admittedly, I welded in some I didn't mean to. Speedo, clutch linkage.

**1971Stepside** · 03-18-2003, 03:23 PM

I updated the picture with the comments that were given.

72MARIO · 03-19-2003, 05:59 PM

Run the speedo along the floor and up the fire wall

03-17-2003, 10:27 AM	#1
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	What are all these holes for? Here is a pic of the firewall and it has been so long since I pulled this truck apart I don't remember what all the holes are for on the firewall. Here is a pic. I know the brake, column, fuse block, speedo holes, but thought this picture might help others as well. Attached Images __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

03-17-2003, 10:41 AM	#3
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	This is what mine looks like Hope this helps __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

03-17-2003, 10:44 AM	#4
Slammed67 Progress = 0% Join Date: Nov 2001 Location: Kansas City, MO Posts: 2,108	What holes? Hmmmmm?..... I must have a different year cab __________________ Jason - '67 GMC swb \| '57 Bel-Air 4dr hardtop \| '56 210 4dr Wagon \| 2000 GMC Sierra

03-17-2003, 10:50 AM	#5
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	Thanks Dubie that helps a lot. Slammed...that is what I am trying to do to mine, but didn't want to cover up something too important. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

03-17-2003, 11:08 AM	#6
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	Does this look right? The few smaller holes are for screws and those rubber plugs for holding the mat in place on the inner firewall. Let me know if these are wrong. I had to do this in paint so it kinda messed with the colors. Attached Images __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far." Last edited by 1971Stepside; 03-18-2003 at 03:23 PM.

03-17-2003, 10:39 AM	#2
jtnixon Registered User Join Date: Feb 2003 Location: Montana Posts: 7	Clutch linkage, throttle cable, e-brake, oil pressure line, wires to rear of truck

03-17-2003, 01:12 PM	#7
Tennman 71 Chevy 4x4 Join Date: Jan 2000 Location: McMinnville,Tn. USA Posts: 450	This is the reason i luv this place !!!!!!!! Way to go other there guys !! I'm inpressed !!!!! __________________ Tenn.man(a.k.a.Danny Cummings)

03-17-2003, 01:40 PM	#8
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	That's great. I'm in the process of putting mine back together too, and it's great to have pics & diagrams to look at. Now, can somebody show me where everything else goes! __________________ 1970 C/10 SWB Stepside

03-17-2003, 01:43 PM	#9
barn9 Half a bubble off! Join Date: Jun 2000 Location: Winfield, Ks, USA Posts: 5,588	You got it Tennman! This is what it's all about! __________________ Just call me LB. '71 Cheyenne, 402BB, hauls blondes, brunettes, or redheads.

03-17-2003, 09:46 PM	#10
DarkFox1 in WAY over my head Join Date: Sep 2001 Location: Douglasville GA Posts: 923	wow 71stepside, you've been busy! I haven't gotten a single thing done to my truck since I put it on the wheels. I just recently sold a 72 project truck to what sounds like a good future. A local man bought it to restore for his youngest son to drive exactly the future that great truck deserves. Lookin good man, at this point I oculnd't tell you on the holes either lol

03-17-2003, 09:52 PM	#11
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	I have the same problem when I tear something apart. Takes time to get back too. Since I use a Digital Camera alot anyway, I started using it as I work on something. Before, during, and reassembly. Saved my bacon many times. Use it when working on my bike as well. Nice work guys.............. __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

03-17-2003, 10:43 PM	#12
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,052	There is one hole in the center of the fire wall for the heater I would not fill it in I think you need it for the Vintage Air kit too.I routed my washer hoses form the inside of the cab and through fire wall and into the cowel I dont know how to explain it though.. The other holes are for the insulation plugs. And one more there are two screw holes on either side of the steering coloum they are for a seal from the steering coloum to the firewall. I am going to weld studs in thoes holes the length of the original screws the put a nut on the inside. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

03-17-2003, 11:36 PM	#13
Slammed67 Progress = 0% Join Date: Nov 2001 Location: Kansas City, MO Posts: 2,108	Isn't the hole labeled "trans linkage" actualy for the clutch rod? Or is that what you meant? __________________ Jason - '67 GMC swb \| '57 Bel-Air 4dr hardtop \| '56 210 4dr Wagon \| 2000 GMC Sierra

03-18-2003, 06:36 AM	#14
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	The hole labled "Trans linkage" is where my accelerator pedal linkage is. Just my $.02 __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.

03-18-2003, 10:58 AM	#15
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	Yes, that is what I meant by trans linkage...should be relabled I guess to clutch linkage. This is a 71 cab and the holes and cabs do vary a little bit on the firewall I have found. Lost Wages' 68 cab has a few different holes so keep that in mind. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."



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03-18-2003, 01:56 PM	#16
72BBGMC Registered User Join Date: Jun 2000 Location: georgia Posts: 284	you have the hole for the oil pressure line marked wiring, second hole above the throttle cable hole.

03-18-2003, 02:30 PM	#17
hobby67stepside Registered User Join Date: Dec 2001 Location: NW Iowa Posts: 952	I don't seem to have many holes either! Admittedly, I welded in some I didn't mean to. Speedo, clutch linkage. __________________ '05 2500 HD Silverado 6.0 liter '97 2500 4X4 454 eng '92 2500 4X4 350 eng '78 K20 4X4 400 eng '70 Boss 302 (owner for 27 years) '57 Ford shortbox 383 stroker TH350 tranny '23 T-bucket (built in '78) '02 Explorer '67 C-10 short step NW Iowa

03-18-2003, 03:23 PM	#18
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	I updated the picture with the comments that were given. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

03-19-2003, 05:59 PM	#19
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,052	Run the speedo along the floor and up the fire wall __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

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