So I would like to do a conversion one my own on the cheap as I have access to a machine shop. I have a 70 el camino. I see many people turning down the hub-rotors to make a hub, but heres my question, is it possible to just use the hub from some front drum brake car on my stock disc brake spindle, then I only have to make a bracket for the c5 calipers. Or is there some reason no one has done this, or have a lot of people done this and I just haven't found it.

I believe what you are trying to do will work. I am using turned down drum hubs on my stock drum spindles - however, since my C5 brackets are made from flat stock (home brewed), the spindle had to be machined down so the lower caliper boss and upper caliper boss are at the same height (thickness). I think the disk spindle already has the two bosses at the same high, therefore, turn your drum hubs down and make a bracket then you're all set. Hope this helps.

There are a few companies that offer brackets for this swap.

I used Kore3. I bought the entire kit, but I believe they sell the brackets and hardware separately (around $115 or so). They include hardware (bolts and spacers) to accommodate the different boss heights (you can use either drum or stock disc spindles). The brackets weren't just plain flat stock, but had machined portions (I guess to allow a thicker bracket?)...

They use the stock drum brake hubs, turned down slightly to fit in the rotor hat... 64-72 Chevelles (I think all years), disc or drum, use the same wheel bearings, so the drum hubs from a Chevelle (64-72) will bolt on the 69-72"Chevelle" disc spindle. I guess that would be all A-body... Not sure if the othebody styles would be the same, but I'd guess there'd be alot of interchangibility...

Yeah I might just end up using the drum hubs and spindles from my chevelle to put on my el camino so I can just throw the whole disc set up from the el camino on the chevelle. Sounds backwards really since the el camino is much nicer. But if it just takes a little bit of grind, or milling not a big deal. Like I said id much rather make my own brackets as I have access to a machine shop for free. Possibly right my own program to just run them on the CNC. for the cost of the steel. What size steel are you using. 3/8" what did the stock cost for that, steels a little expensive now still must be a lot cheap than 120 bucks though.

just two other points - buy the Kore3 12" braided lines for the front. They convert the your sae hard lines to the 10mm banjo you need for the C5's - also - Use a 3/4 or 7/8" bore MC - anything bigger will not give you the line pressure needed for C5 calipers. (i've had 3 MC's now!!!

So I found out the Disc brake spindle hub top boss is lower, (not equal height to the other holes as we were assuming) compared to too high with the drum spindles.
So at this point I feel like I'm going to need to do machining on the drum hubs no matter what, I will likely end up using those for the c5 conversion. It would be possible to use the disc brake spindles with a spacer but then in my case where I want to end up with the disc brakes on my chevelle, it seems easier to do the drum spindles for my el camino.

http://my.fit.edu/~kreihl/airride/CIMG0259.JPG (http://my.fit.edu/%7Ekreihl/airride/CIMG0259.JPG)

That seems to be my consensus unless anyone has any better input for me. Maybe this will help other people also.

Either way, it'll still be about the same amount of work. Cut some tube stock for a spacer(weld to caliper bracket), or machine down the drum brake spindle to the same height(thickness) of the other boss. I personally would want the caliper bracket to be flush on the spindle, instead of a longer bolt with a spacer. My .02.

That was my opinion so thats why im planning on using the drum spindles and put all original disc on the chevelle that had drums. c5 conversion is for the el camino, chevelle will eventually be sold

I machined down my hubs so the the c5 rotor fits on them now, I noticed that the disc rotor can rotate a couple degrees due to the lugs being smaller than a c5 lug maybe? Does anyone know if people normally change out to a larger lug?

Also I plan on using a 1 inch maybe even 1.25 inch wheel spacer for the front to accept new large wheels does anyone think this might cause any problems?

Thanks for any help

Sounds like you need bracket #3:

http://www.kore3.com/proddetail.php?prod=10083-01

No actually I will likely be making my own brackets, I'm not concerned with that yet, I am just worried about the play in the disc rotor and the 5 lugs.

No actually I will likely be making my own brackets, I'm not concerned with that yet, I am just worried about the play in the disc rotor and the 5 lugs.

Drill out the stud holes in the hub and press in the right studs.

Thats what my question is, what are the right studs. Are people using the standard 7/16s that were in there or do the new vettes use a bigger stud. What size should i drill out the holes to.

The c5 vettes studs are 12mmx1.50; even still the rotors rotate a couple degrees on the stud; on oem c5.

What size should i drill out the holes to.

I plan to upgrade to 12x1.5 studs one day. I bought 1 vette stud and can post the knurl dia. From what I found on another site, you would want anywhere from .005 to .015" press fit.

Now I'm not sure if it's just a matter of drilling and reaming with a hand drill, or is a bridgeport needed?