Help!!! 64 Polara 500 firewall bolts

[Polara 500 707]

Ok guys, going to lean on everyone’s knowledge here. I’m cleaning up the firewall on my 64 Polara 500. Not fully smoothing it out, but getting rid of a few holes and such.

The car was partially disassembled when I bought it so I’m not sure WHAT mounts on these 3 studs (see pics)! 99% sure the master cylinder mounts in the four holes below, but no idea about the 3 studs in the triangular shape above. I don’t think it was a brake booster. Pretty sure this was a single bore MC. Thanks gentlemen!

 

[Ski 61701]

There should be a rectangular heavy gauge plate that bolts to top 2 bolts and extends down past the master cylinder. Its a stiffening plate so when you push down the brake pedal the firewall does not flex.
The lower middle bolt holds a flat wire bracket that holds part of wiring harness in place. The metal bracket will have a hole in it . The bottom 2 holes in the firewall are used to secure bottom part of stiffening plate to firewall

 

[Ski 61701]

Here is the plate in question

 

[493 Mike]

And another one:
Mike

 

[Sixpaksteve]

There should be a rectangular heavy gauge plate that bolts to top 2 bolts and extends down past the master cylinder. Its a stiffening plate so when you push down the brake pedal the firewall does not flex.
The lower middle bolt holds a flat wire bracket that holds part of wiring harness in place. The metal bracket will have a hole in it . The bottom 2 holes in the firewall are used to secure bottom part of stiffening plate to firewall

Ski is correct, and as an additional FYI, 2 slightly different style plates were used on the 64 Dodges. The plate for a manual braked car was different than a car equipped with power brakes.

 

[Polara 500 707]

Thanks for all of the replies. And the pictures really help too! I’ve got that plate set aside. I’ll check to see which one it is.

I am going to do a disc brake swap, but I can only imagine that stiffening plate will still need to be in place.

 

[Polara 500 707]

Here is the plate in question

View attachment 956192

VERY CLEAN car you have there!

 

[Polara 500 707]

And another one:
Mike
View attachment 956220

very helpful! I think your car color may be what mine originally was. I think my paint code is DD. Someone did a back mask paint job over it at some point. Actually going to have a paint shop do a spray out for me soon. Luckily a few parts on the car weren’t painted so they’re going to scan the color.

 

[Ski 61701]

Thanks for all of the replies. And the pictures really help too! I’ve got that plate set aside. I’ll check to see which one it is.

I am going to do a disc brake swap, but I can only imagine that stiffening plate will still need to be in place.

Yes you will need that plate in place.