Firewall holes, what are they for? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

danw210 · 08-20-2009, 12:56 AM

I have seen some posts with pictures of a firewall and detailed info of what each hole is for. Does anyone have this pic or know who might have it?
Thanks!

petey-pablo · 08-20-2009, 01:44 AM

Here's one that's helped me in the past it's from one of the replies I got here on the board from another Thread, Hope it helps ..

danw210 · 08-20-2009, 01:53 AM

Thats one of them, thanks.

I do have a question though. On my cabs, there is another hole under the speedo hole and my fuseblock cut-out is positioned a little to the right, closer to where the e-brake cable would come through. I have a 67 cab and a 68 cab. What would the hole under the speedo hole be, and will I have any trouble when I put a 69-72 e-brake set-up in? Has anyone done this? Will I have to move the fuseblock???

danw210 · 08-20-2009, 02:09 AM

Here is what I am talking about.

petey-pablo · 08-20-2009, 05:07 AM

WOW your right I have no Idea what would go there. I know someone will chime in soon and help out..

danw210 · 08-20-2009, 08:50 AM

I'm thinking that the second hole {under the speedo hole) might be for an e-brake cable for a 67-68.....anyone?????

Rack Man · 08-20-2009, 09:29 AM

Fuse Block & Speedo...??

Note: A lot of PO drilled extra holes for stuff!

dan42 · 08-20-2009, 09:31 AM

I don't know - mine has the extra hole too - I'm running my amp hot lead through it though, so I'm kinda glad it's there.

danw210 · 08-20-2009, 09:50 AM

Quote:

Originally Posted by Rack Man

Fuse Block & Speedo...??

Note: A lot of PO drilled extra holes for stuff!

I have two cabs that are identicle. What are the odds of two cabs being cut up at the same exact places? They look awfully factory to me.

gcburdic · 08-20-2009, 12:18 PM

I put a delete plug in mine.....and here's where the ebrake cable goes!

chevy_mike · 08-20-2009, 12:44 PM

Not sure if this pic helps but this is my '68 right after I removed the front clip.

Speedo cable in the lower hole, plug in the upper. Fuse block in the big square hole. Round hole above the square one is the brake warning light. Rectangle hole below steering column is the e-brake cable.

Hope it helps.

danw210 · 08-20-2009, 01:15 PM

Thanks Chevy_Mike, that does help.

Bert W · 08-20-2009, 03:20 PM

That is the same set up on my 68. Fused wire coming out of the top hole plug (haven't traced it down yet) and Speedo cable in the bottom hole.

**Bowtie468** · 08-24-2009, 05:17 PM

It's been a few years since i disassembled mine, but i'm sure that the lower is the speedo cable and the upper is the manual choke cable. Thats how mine was arranged on my '68. Hope this helps !

Bert W · 08-24-2009, 05:39 PM

I looked at mine again. I was wrong. I only have a plug in the top hole and speedo cable in the bottom.

orange prostreet69 · 08-31-2009, 09:48 PM

Where does the tach harness come through firewall or could that be it?

08-20-2009, 12:56 AM	#1
danw210 69 K20 Join Date: Mar 2009 Location: Elizabethtown, KY Posts: 426	Firewall holes, what are they for? I have seen some posts with pictures of a firewall and detailed info of what each hole is for. Does anyone have this pic or know who might have it? Thanks!

08-20-2009, 01:44 AM	#2
petey-pablo "THE GREEN GOBLIN" Join Date: Mar 2008 Location: Fremont Ca. Posts: 1,025	Re: Firewall holes, what are they for? Here's one that's helped me in the past it's from one of the replies I got here on the board from another Thread, Hope it helps .. Attached Images __________________ Petey-pablo "THE GREEN GOBLIN" 1972 Cheyenne 10 Short Fleet Side Front 2.5inch Spindles with 2inch Springs Rear 4inch drop Springs. 454BBC TH400,Posi 1971 Cheyenne 10 Long Fleet Side 454BBC TH350,Posi Sold Drive it like you stole it! Petey-pablo@sbcglobal.net

08-20-2009, 01:53 AM	#3
danw210 69 K20 Join Date: Mar 2009 Location: Elizabethtown, KY Posts: 426	Re: Firewall holes, what are they for? Thats one of them, thanks. I do have a question though. On my cabs, there is another hole under the speedo hole and my fuseblock cut-out is positioned a little to the right, closer to where the e-brake cable would come through. I have a 67 cab and a 68 cab. What would the hole under the speedo hole be, and will I have any trouble when I put a 69-72 e-brake set-up in? Has anyone done this? Will I have to move the fuseblock??? Last edited by danw210; 08-20-2009 at 02:14 AM.

08-20-2009, 02:09 AM	#4
danw210 69 K20 Join Date: Mar 2009 Location: Elizabethtown, KY Posts: 426	Re: Firewall holes, what are they for? Here is what I am talking about. Attached Images

08-20-2009, 05:07 AM	#5
petey-pablo "THE GREEN GOBLIN" Join Date: Mar 2008 Location: Fremont Ca. Posts: 1,025	Re: Firewall holes, what are they for? WOW your right I have no Idea what would go there. I know someone will chime in soon and help out.. __________________ Petey-pablo "THE GREEN GOBLIN" 1972 Cheyenne 10 Short Fleet Side Front 2.5inch Spindles with 2inch Springs Rear 4inch drop Springs. 454BBC TH400,Posi 1971 Cheyenne 10 Long Fleet Side 454BBC TH350,Posi Sold Drive it like you stole it! Petey-pablo@sbcglobal.net

08-20-2009, 08:50 AM	#6
danw210 69 K20 Join Date: Mar 2009 Location: Elizabethtown, KY Posts: 426	Re: Firewall holes, what are they for? I'm thinking that the second hole {under the speedo hole) might be for an e-brake cable for a 67-68.....anyone?????

08-20-2009, 09:29 AM	#7
Rack Man Registered User Join Date: Sep 2008 Location: Tempe, AZ Posts: 770	Re: Firewall holes, what are they for? Fuse Block & Speedo...?? Note: A lot of PO drilled extra holes for stuff! __________________ My Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=309288 Last edited by Rack Man; 08-20-2009 at 09:30 AM.

08-20-2009, 09:31 AM	#8
dan42 Registered User Join Date: Feb 2007 Location: Cali Central Coast Posts: 5,191	Re: Firewall holes, what are they for? I don't know - mine has the extra hole too - I'm running my amp hot lead through it though, so I'm kinda glad it's there. __________________ '67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7

08-20-2009, 12:18 PM	#10
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: Firewall holes, what are they for? I put a delete plug in mine.....and here's where the ebrake cable goes! Attached Images __________________ 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; 08-20-2009 at 12:24 PM.

08-20-2009, 12:44 PM	#11
chevy_mike Never Ending Projects Join Date: Jul 2006 Location: San Diego, CA Posts: 3,836	Re: Firewall holes, what are they for? Not sure if this pic helps but this is my '68 right after I removed the front clip. Speedo cable in the lower hole, plug in the upper. Fuse block in the big square hole. Round hole above the square one is the brake warning light. Rectangle hole below steering column is the e-brake cable. Hope it helps. __________________ . 1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often...

08-20-2009, 01:15 PM	#12
danw210 69 K20 Join Date: Mar 2009 Location: Elizabethtown, KY Posts: 426	Re: Firewall holes, what are they for? Thanks Chevy_Mike, that does help.

08-20-2009, 03:20 PM	#13
Bert W Registered User Join Date: Dec 2008 Location: Jackson, MS Posts: 373	Re: Firewall holes, what are they for? That is the same set up on my 68. Fused wire coming out of the top hole plug (haven't traced it down yet) and Speedo cable in the bottom hole.

08-24-2009, 05:17 PM	#14
Bowtie468 Senior Member Join Date: Jun 2002 Location: Cecilia, Louisiana Posts: 1,638	Re: Firewall holes, what are they for? It's been a few years since i disassembled mine, but i'm sure that the lower is the speedo cable and the upper is the manual choke cable. Thats how mine was arranged on my '68. Hope this helps ! __________________ Chris click here to see my buildpage http://67-72chevytrucks.com/vboard/s...d.php?t=394656 ---------------------------------- 1979 C10 Silverado Big10 SWB Factory 454/400 Cardinal Red/Santa Fe Tan (original paint) 1969 Camaro X44 LS swap 1968 C10 SWB Fleetside (SOLD) 468BBC MultiPort TPI / Dynamic EFI P4 Black/Black 1963 Nova SS convertible (SOLD) 194 I6/ PowerGlide

08-24-2009, 05:39 PM	#15
Bert W Registered User Join Date: Dec 2008 Location: Jackson, MS Posts: 373	Re: Firewall holes, what are they for? I looked at mine again. I was wrong. I only have a plug in the top hole and speedo cable in the bottom.

08-31-2009, 09:48 PM	#16
orange prostreet69 Registered User Join Date: Aug 2009 Location: Manassas, Va Posts: 60	Re: Firewall holes, what are they for? Where does the tach harness come through firewall or could that be it?



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