Firewall Help Needed

[da_bears_da1]

I am cleaning up the firewall on my 65 SBSS; the PO drilled a number of holes. I want to weld up everything that I am not going to use. I am trying to figure out what the two holes circled below are for. I really would appreciate some guidance on what the holes are for. Thanks!

[1963c-10]

clutch push rod and emergency brake cable(small hole)

[da_bears_da1]

Thank you!

[ACK]

Not to create confusion, I was looking into grommets for those holes for my '64 over the weekend and the big one had nothing going through it, the small one had the speedometer cable, and the parking brake cable went through the rectangular hole just below the steering opening.

[azdude1964]

clutch and speedo cable e brake is the square one. are planning on running the factory sound deadner on the firewall? if not you can fill them too.

[jonzcustomshop]

Originally Posted by ACK

Not to create confusion, I was looking into grommets for those holes for my '64 over the weekend and the big one had nothing going through it, the small one had the speedometer cable, and the parking brake cable went through the rectangular hole just below the steering opening.

Originally Posted by azdude1964

clutch and speedo cable e brake is the square one. are planning on running the factory sound deadner on the firewall? if not you can fill them too.

agree, just pulled mine apart... clutch speedo, then the square is e. brake


anyone know how the automatic trucks were set up? no hole for the clutch rod, or did they have a rubber plug?

[da_bears_da1]

Originally Posted by ACK

Not to create confusion, I was looking into grommets for those holes for my '64 over the weekend and the big one had nothing going through it, the small one had the speedometer cable, and the parking brake cable went through the rectangular hole just below the steering opening.

Glad you clarified it! From what I could tell from the shop manual, I thought the square one was e brake.

Originally Posted by azdude1964

clutch and speedo cable e brake is the square one. are planning on running the factory sound deadner on the firewall? if not you can fill them too.

I am planning not using the firewall mat, I am going to use Dynamat. I have already removed the studs for the firewall mat and filled them. Will go ahead and fill the larger one for the clutch, mine is an automatic. It is kind of confusing since this same cab was used for so many different versions of the truck.

[azdude1964]

yes square is e brake as it goes through the frame. glad to help..

[1963c-10]

So the mystery is what is the large round one then?

[da_bears_da1]

Originally Posted by 1963c-10

So the mystery is what is the large round one then?

First response said it was the clutch push rod which makes sense.

[Chevy Fleetside]

The small hole next to the large one is where the plug for the tail lights harness goes through.

[azdude1964]

wrong sir. tail lights goes higher on the fire wall. the big hole is the clutch rod hole. it large because of the swing of the bell crank. When factory it has a boot on it.

[azdude1964]

ok here is the diagram for the cluch bell crank.hope this helps

[WhippinSaw]

I have an automatic to, is there an aftermarket plug for the clutch hole?

[azdude1964]

not that i know of but you could use a plug for a sink like for the extra holes for filltered water .

[azdude1964]

looks like you got the welder just make a patch for it.

[travz500]

clutch rod for sure on one of them