Firewall Holes
 

How many of these holes belong here?

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I've come up with the following:
1 hole - Choke & Throttle cables
1 hole - Wiper vacuum hose
3 holes - Voltage regulator
2 holes - Starter Solenoid
2 small, 1 large - Wiring Harness and grommet
4 holes - data plate

There are a series of holes around the perimeter that are for the firewall insulator retainer clips, which would also include two that double as the throttle linkage attaching hardware, too.

There are a number of extra holes that look like someone punched them through with an ice pick. I assume the holes for the firewall insulator would be holes drilled or punched by the factory and would have a smooth feel to them. Does that make sense?

Yes, it does make sense. And it's likely 99% of them are factory. Every firewall I've ever seen has all kinds of different holes, some necessary, others that make you scratch your head. Some are cleanly punched, some are exactly like you describe. You're on the right track trying to figure out what's what. Worse case, you weld one up you have to redrill later. No big deal.

Dan,
If you want to bring it down to Hamden, I'll show you which ones to fill.
Chuck

Thanks for your comments. I like your approach - if you make a mistake it's easy enough to red rill.

Chuck,
Thanks for the offer. The cabs at a body shop in Glastonbury right now to be sandblasted and he's offered to fill in the holes while he's at it. Just need to tell him which ones to fill.
Dan

There are also a couple or three, mostly just under the cowl lip, that are for wire retainer clips.

Does the speedometer cable come up through the floorboards like the e-brake cable or does it go through the firewall?

It goes through the big hole at the top left hand corner of the passenger side toe board where it meets the vertical fire wall.

I was thinking about just filling all the holes and redrilling as needed since my truck had no wireing on anything useable under the dash.

There's certainly nothing wrong with that plan, especially if you're doing a full custom and want to do all your own thing. But if you're planning to utilize any of the original items; linkage, looms, etc., having a plan to know what you need and don't need will save a ton of time end effort. Welding and grinding 110 holes isn't fun. If you can cut that in half using a systematic strategy and some forethought, it's a plus.

I totally agree. I really don't know what holes I'll need to keep open at this point since I really haven't gotten that far yet. I'll be watching this thread to for ideas.

110 holes - now you are just exaggerating. I only had to fill 45 in mine, but that doesn't count where the PO had butchered out the top of the trans tunnel and the driver's half of the engine recess so he could scab in a gas pedal:-X03.

Only 110 holes?...sure seemed like more than that and I left the obvious ones alone...lol. And what's with the holes that look like they were made with a nail gun or hammer and a spike like Dan mentioned above? Those one were sure hard on skin if you happened to brush against them.


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