*****UPDATE***** 1971 B-Body firewall help please

71 Super Bee that I took apart in March and finally got back to.
I painted engine compartment and the engine.
I have one more hole next to booster opening that I can't remember what to put in it??? Do I have all the other's in the right places also? Getting old is harder than I thought!!
Car is LA build non A/C 383 4 speed with a clock but previous owner did add Tach but I believe that goes through bulkhead.
Can't imagine I never noticed this hole open before.
Thanks in Advance and stay young!!!

Ron

If this is any help, my runner after stripping, i don't have that hole??

The hole I have is that dimple your car has. My best guess is that it was there behind the booster and didn't realize that when I pulled the booster off. Maybe the previous owner thought he needed it for a tach and then later realized that the tach is through the bulkhead.
Ron

I think the headlight door harness goes there.

My 71 RR has the same hole (something missing)…

Mine is Early St Louis car 383, 4-speed, non-A/C, A/G

Anyone else have any ideas??? 8-)

Chuck

RJS- I'm pretty sure that is for a tach harness. If there was a whole on the other side, it would be for headlight door harness.

Factory tach 71 Charger St Louis plant dimple but no hole

I think the cruise control harness goes through there?

https://www.forbbodiesonly.com/moparforum/threads/1971-b-body-firewall-help-needed.164802/page-2

Just noticed you have two extra holes, one has a flat bottom, what is that for? Does it look factory?
I have a picture of a Cuda firewall and that hole was used for the roadlamp harness. I have no idea if that was even an option on 71B's

There is just one extra hole, the one that looks like it has a flat bottom but is paint buildup from behind.
That's the hole I am speaking of, left of booster and right of fuse block nut. I now fully believe it was there and just behind booster. I have nothing left to put there except for a plug. Previous owner had put a reproduction tach in but it is spoken for through the harness.

I had put all my parts as I removed them in the trunk and the trunk is now empty aside from aircleaner assembly and wipers...

speedo cable is in
clutch interlock in
hood release in
hidden headlights in
dash reverse light in
back up lights in
clutch rod in
1"rubber plug near fender in

Ram Charger lines in (passenger side)

NO cruise control

Must need a rubber plug at this point that would be hidden behind booster.

Ron

Here's a comparison with the diagram for 70 E-body, I guess 71 B used basically the same firewall?

On my 71 high option Charger r/t that hole was used for the cruse control and maybe at one time your car had one ? Maybe a factory mistake ?? Dealer installed ? Who knows , but Im 100% shure it was the cruse control .

I fully believe you are right but I also believe a previous owner did this by mistake. Car doesn't have cruise control.

The reason I never knew about this hole is that I just discovered that the booster backing plate fully covered it!!!
I put a plug in it and now when everything is back on it is covered and sealed!!

***** I will start a new post about the backing plate to see if I have the correct one for my application.

I want to thank everyone for the help.
Ron

Nicely done!