Firewall holes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72Mountaineer · 01-10-2023, 06:18 PM

Getting along with the 64 C10 project, need a map or diagram of the holes to see which ones will be needed. Some are obvious, some are not.

jweb · 01-10-2023, 07:17 PM

Here's a diagram

ray_mcavoy · 01-12-2023, 06:35 PM

That's a really good diagram. I'd just like to add that I think the hole marked "choke cable" was only used for 6-cyl engines. Pretty sure V8's had their choke cable running through another hole in the same grommet as the oil pressure line.

Also, trucks with factory windshield washers will have an additional hole for the hoses to pass through located a few inches up above the "blower fan" wire hole.

01-10-2023, 06:18 PM	#1
72Mountaineer Registered User Join Date: Oct 2010 Location: Where Mountaineers are free Posts: 399	Firewall holes Getting along with the 64 C10 project, need a map or diagram of the holes to see which ones will be needed. Some are obvious, some are not.

01-10-2023, 07:17 PM	#2
jweb Registered User Join Date: Apr 2010 Location: Oregon Posts: 1,182	Re: Firewall holes Here's a diagram Attached Images __________________ 1951 Truck, LS1/4L60 1964 Suburban, current project 2014 Silverado daily driver 1953 Westerner "canned ham" trailer, rebuilt 1974 Prowler trailer, rebuilt

01-12-2023, 06:35 PM	#3
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,358	Re: Firewall holes That's a really good diagram. I'd just like to add that I think the hole marked "choke cable" was only used for 6-cyl engines. Pretty sure V8's had their choke cable running through another hole in the same grommet as the oil pressure line. Also, trucks with factory windshield washers will have an additional hole for the hoses to pass through located a few inches up above the "blower fan" wire hole.



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