Firewall holes: What is original.
 

Holes numbered 1 through 4. I don't think any of these are factory. Do you agree?

Re: Firewall holes: What is original.
 

If you are going back to original. NON of the four hole are there originally. someone had installed a hot water heater there.

Re: Firewall holes: What is original.
 

Someone did a nice job making the holes!

Re: Firewall holes: What is original.
 

I had the same 3/4 in holes.I was thinking about replacing the firewall, looked it over and what a job to do that. So a friend suggested filling the holes with a gas weld with my amazement it worked. The holes filled in perfectly can't even tell they were there!

Re: Firewall holes: What is original.
 

You can use washers, and/or electrical box knockouts.

Re: Firewall holes: What is original.
 

Even rubber pop in plugs look pretty well after painted.
Bill W.

Re: Firewall holes: What is original.
 

How did you handle welding with the gas tank a few inches away?

Re: Firewall holes: What is original.
 

Well, apparently John did it SAFELY, he's still typing:D
Bill W.

Re: Firewall holes: What is original.
 

That's a good one

Re: Firewall holes: What is original.
 

The holes were far enough away from the tank. The top hole was about 3-4 in below the tank

Re: Firewall holes: What is original.
 

You are lucky, I had fifty-three non-stock holes in the firewall/cab of my 31 AA 82B cab. Took a lot of fitting to clean them up. Apparently they ran some hydraulics off a pump mounted to the engine and the lines and wiring went through the cab to the flat deck. Silverlining was that all that leaking hydraulic fluid preserved the original wood quite nicely

Re: Firewall holes: What is original.
 

Holes shown are original.