I was originally planning on building my own adapters, however after spending a few hours and making a template out of wood...
I started digging more for a shape that works, and to get an idea how much work this will really be.
So I noticed a fresh listing on ebay:
https://www.ebay.com/itm/13334228300...m=133342283002
Seller: 1976ls1
Note that he also has parking brake shoes available for a separate price that have been modified to work with the upgraded rotors, message him for details.
Lists his adapters to work with the C6 Z51 13" rear brakes.
So I started asking him some questions, he was very responsive and helpful.
In the end, I decided that if I put a price on my time vs how much these cost me, I end up ahead.
And I very much like the idea of having 13' in rotors up front, and 13' rotors in the back.
So I made the purchase.
I received the package in the mail, and started tinkering and to make sense of the instructions.
What I ended up with,
So I had originally planned on going with C5 rear brakes, so I had the C5 rear calipers, brackets, and rotors.
Chatting with the seller, he told me that the only real difference between the C6 Z51 calipers and the C5 base is the piston size.
With the C5 having the larger piston.
So since I have the C5 rears already, lets take a look at sizing differences.
Original 84 Rear Rotor on top of the C5 Rear rotor
C4 rear rotor vs the C6 Z51!
Next issue, the kit is meant to mount to a later knuckle with a 12mm bolt.
My 84 has a 10mm mounting bolt.
I did a little measuring with a dial caliper, and decided I have plenty of material to keep this safe.
I found I did not quite have the right size drill, and with a hand drill it's likely to do some grabbing/damage to the hole.
Enter my die grinder with sand paper rolls from Summit Racing!
(Well used!)
I went slow, ensuring I kept a nice round circle.
Used the included 12mm bolt to check the hole front and back as I went.
Once I had it close, I used the fine grit paper roll to fit the bolt nice and snug.
modified hole picture.
As for the parking brake shoe, I'll go more into detail there a little later.
However, this is a modified set sitting inside of the drum.
I ran into one very confusing thing with the included instructions.
There is this sorta thick washer with some red coloring on it, instructions show that the washer goes on "this side only" and has two arrows.
What I found is the washer only goes on the lower bolt...
Instructions with some red pen love...
Washer installed on the car
Then the parking brake cable bracket needs to be trimmed to make room for the caliper bracket mounting bolts..
This is my first attempt, the second attempt opened the lower cut a little more..
Also airtools are the shit.
Also, the instructions specified that i was to trim the dust shield.
i noticed that it did not block anything, other than a mounting bolt...
my solution.