S10mk
Poster
Posts: 57
Reg: 01-03-19
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08-04-23 09:05 AM - Post#2861104
I was browsing Craigslist and saw these, they’re not mine. NOS hubs and rotors. 160 a pop. Allentown, pa
https://allentown.craigslist.org/pts/d/east-texas-...
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 toro455
"9th Year" Gold Supporting Member
Posts: 1408
Loc: Western NY
Reg: 06-15-02
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08-04-23 06:22 PM - Post#2861123
In response to S10mk
Pretty crazy to see a NOS rotor so it was worth a view. I'm using 69-83 Corvette rotors and hubs with 69 Impala calipers/steering arms/dust shields on my 1968 Impala and everything seems so ideal with the position I would never bother chasing NOS parts for the Impala.
The 69-83 Corvette spindle is the same PN as the 1969 Impala. One of mine is from a 69 Impala and one from a Corvette as the bearing surface was scored on the second Impala spindle.
Hopefully someone who really "needs" a NOS part sees it so good that you posted.
Scott
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S10mk
Poster
Posts: 57
Reg: 01-03-19
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08-05-23 07:04 AM - Post#2861131
In response to toro455
I figured that someone would appreciate it, there simply can’t be many NOS rotors left in existence. I plan on piecing together the same brake setup as yours for my 67. I’m currently running NOS drums and shoes on the front, but an LS swap is in my future so I’m going to upgrade to the 69-70 single piston discs. It seems like everything is readily available with exception to the original caliper brackets. Once I find the caliper brackets, I’ll get started with the rest of the swap.
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toro455
"9th Year" Gold Supporting Member
Posts: 1408
Loc: Western NY
Reg: 06-15-02
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08-05-23 10:24 AM - Post#2861138
In response to S10mk
The original backing plates (dust shields) are also very hard to find. When I bought some of the Corvette parts I, just in case, bought a Corvette backing plate which I still have sitting around. The original 69 Impala dust shields I had looked bad but it was amazing how nicely they cleaned-up.
Scott
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Tony1963
Frequent Contributor
Posts: 2448
Loc: Orlando Florida
Reg: 07-09-18
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08-07-23 03:04 AM - Post#2861191
In response to toro455
Somewhere there was a post in the past where someone found an aftermarket Centric rotor that had the proper dimensions. It wasn't exact, but worked fine.
| People fear change because it threatens what they know, or what they claim to know. |
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toro455
"9th Year" Gold Supporting Member
Posts: 1408
Loc: Western NY
Reg: 06-15-02
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08-07-23 10:41 AM - Post#2861203
In response to Tony1963
The Centric reference is in the sticky "The last word...".
That said I think using the Corvette parts is a better idea. The reason is with 1969 through 1983 Corvette using the same PNs there's virtually no chance that the parts will become difficult to find. If you decide to use the original, or the replacement, Impala rotors the hubs were only used for 2 years. I've posted photos of my Corvette/Impala hybrid set-up before.
Scott
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S10mk
Poster
Posts: 57
Reg: 01-03-19
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08-08-23 06:56 AM - Post#2861220
In response to toro455
For schnitz and giggles I was just looking on eBay and I found both front caliper brackets and one dust shield for a 70 Impala. I immediately hit “buy now” and I’ll be building a hybrid disc set up like yours. Thanks for the pictures in your threads Scott, it’s a big help.
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toro455
"9th Year" Gold Supporting Member
Posts: 1408
Loc: Western NY
Reg: 06-15-02
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08-09-23 08:02 AM - Post#2861256
In response to S10mk
Great news that you found most of what you needed.
I also wondered what the Corvette caliper and mounting bracket look like. Despite my changes I liked the fact that may calipers have the distinctive "Impala look". I also had the '69 Impala caliper brackets, calipers were available, so I never really considered the Corvette calipers and brackets, but I did wonder if those parts would also work. Given the spindle is the same PN and I'm already using the rotor and hubs for sure the caliper bracket and caliper would bolt-up in locations compatible with each other, but would those positions also be ok for Impala? I guess sometime I should search for Corvette caliper images to see exactly how they mounted... curiosity study only.
Scott
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S10mk
Poster
Posts: 57
Reg: 01-03-19
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08-09-23 08:46 AM - Post#2861258
In response to toro455
The caliper mounting positions look pretty close if not the same, both are mounted on the front side of the rotor instead of the more common rear side of the rotor. I compared the Impala backing plate to the corvette backing plate and they look to be almost identical. I still need one backing plate, so I’m going to grab a corvette backing plate from the wrecking yard to see if I can make it work. Judging from the pictures, I’m almost certain that it’ll do the job.
Also, what combination valve (proportioning valve) are you using?
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toro455
"9th Year" Gold Supporting Member
Posts: 1408
Loc: Western NY
Reg: 06-15-02
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08-09-23 05:28 PM - Post#2861273
In response to S10mk
I have rear drums so I bought the hold-off valve and basically 1969 factory style set-up. At the time I got the hold-off from "The Right Stuff Detailing" which specializes in brakes. Their site was amazing with great information but they were acquired or became part of PUI and possibly one other company so I'm not certain all of the info they had on their specific site survived. Even then I only found the proper PN I needed listed for 1969 Camaro and I'm pretty sure I bought it at Summit Racing but Summit carries The Right Stuff parts. The Right Stuff's site was fantastic regarding proper terminology for proportioning, distribution blocks, combination valves etc.
If you don't care that the hold-off looks like OE then you could also get a combination valve which has all of the functions in a single part. If I still had access to the old site I would make certain I remembered the terminology correctly because virtually everyone calls any form of a block where the lines are split a proportioning valve but the names are actually specific to what the "block" does. The Right Stuff had (has?) a high quality single "block" for basically any combination you need. The cleanest set-up would be to buy a single "block" which has all functions. That's what I did for my Chevelle and it also came from The Right Stuff.
I have one Corvette backing plate but cannot recall for which side. I could take photos if you want to compare; more difficult for me because my Impala parts are on the car.
The caliper bracket has to mount to the Impala spindle because the spindle PN for Corvette and Impala were the same. I really like how they made a single spindle specific by bolting on the specific items.
Scott
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mjc1
Senior Member
Posts: 1819
Loc: Burlington Ontario Canada
Reg: 09-15-04
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08-13-23 04:44 PM - Post#2861490
In response to toro455
Along with the brackets, it's that unique steering arm with the caliper bracket boss, that makes it difficult to piece together a single piston setup. The parts are not often seen outside of a complete setup.
If you ever see a bracket or arm, snag it!
1969 Parisienne convertible, 1967 Grande Parisienne 4DR HT
My Flickr page
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toro455
"9th Year" Gold Supporting Member
Posts: 1408
Loc: Western NY
Reg: 06-15-02
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08-13-23 09:32 PM - Post#2861499
In response to mjc1
Great photo! I still haven't looked to see how the Corvette caliper mounted.
Scott
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S10mk
Poster
Posts: 57
Reg: 01-03-19
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08-14-23 06:27 AM - Post#2861507
In response to mjc1
I had thought that corvettes and single piston impala disks had shared the same steering arm, but I was incorrect. The Impala steering arm has an additional boss to mount the caliper bracket. Whereas the corvette steering arm doesn’t have that boss. So far, I have collected two caliper brackets and one Impala steering arm. I’ll be waiting to do my swap until I can find a second steering arm. Which might take some time, haha.
Edit: I was just reading that 69 and 70 Impala disc steering arms have different part numbers from one year to another. Does anyone know if there’s a functional difference?
https://www.chevytalk.org/fusionbb/showtopic.php?t...
Impala Arms,
3855006 right
3855005 left ... Fit, 65-66 drum brakes
3909786 right
3909785 left ... Fit, 67-69 drum brake and 67-68 4 piston disc setups.
3928626 right
3928625 left ... Fit, 69 disc setups.
3966188 right
3966187 left ... Fit, 70 disc setups.
Edited by S10mk on 08-14-23 06:44 AM. Reason for edit: Additional info
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mjc1
Senior Member
Posts: 1819
Loc: Burlington Ontario Canada
Reg: 09-15-04
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08-14-23 07:02 AM - Post#2861510
In response to S10mk
Well, we do know that in 67 new steering geometry and components were introduced. So the arms likely are a different shape/length.
As far as the difference between the 69/70, no idea as I've done both and never saw any difference. Maybe the steering stops? The tie rods are the same part number both years.
Here's the C3 from behind,
1969 Parisienne convertible, 1967 Grande Parisienne 4DR HT
My Flickr page
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toro455
"9th Year" Gold Supporting Member
Posts: 1408
Loc: Western NY
Reg: 06-15-02
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08-14-23 02:33 PM - Post#2861532
In response to mjc1
Based on the photos I think I might have an idea but not certain...
What about using an Impala 1969/70 Impala drum brake steering arm and the Corvette caliper bracket with the Corvette caliper? I'm making the assumption the drum brake steering arm is missing the caliper support portion; so similar to the Corvette. That of course would only work if that part of the spindle, drum to disc, shares those same mounting bolt locations for the arm.
Mjc1,
Any chance that you have a similar photo with the drum brake steering arm? I wonder if those could even be the same after they made the geometry change you mentioned for 1967? If yes that would make the supply a lot more plentiful. Everything else would be bolt-on so if the 69/70 disc arm became available it would be an unbolt/ bolt-on job.
Scott
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S10mk
Poster
Posts: 57
Reg: 01-03-19
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08-15-23 05:19 AM - Post#2861552
In response to toro455
I’m almost positive that would work, furthermore I think that you could use the 67 drum brake arms with the corvette spindles. In my case though, I would like to use single piston calipers for a few different reasons. But mostly because I don’t have the wheel clearance for the larger corvette calipers. I would need wheel spacers which I would like to avoid.
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mjc1
Senior Member
Posts: 1819
Loc: Burlington Ontario Canada
Reg: 09-15-04
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08-15-23 10:02 AM - Post#2861565
In response to S10mk
Drum brake steering arms will work fine on a C3 setup, I did it on my 67 and others I know have as well.
Here's the thing I'm most curious about, could a 69-70 (big bearing) drum brake spindle be cut down, drilled and tapped to convert it for disc brake use? The only difference between drum and disc spindles (beyond the bigger bearing 69 and up) is that boss height.
I rough measured a disc spindle from the spindle base to the upper bolt boss with a straight edge. I got 1 9/16" plus or minus a 32nd or so. Convinced it can be done, I'll try it on my leftover drum spindles, after an upcoming single piston conversion on a 69. The only limiting DIY factor will be the tap drill size as I believe it's beyond 1/2".
Having the ability to do so would eliminate another piece of the puzzle.
1969 Parisienne convertible, 1967 Grande Parisienne 4DR HT
My Flickr page
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65acadian
Member
Posts: 284
Loc: Manitoba, Canada
Reg: 08-15-04
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09-30-24 09:10 PM - Post#2874325
In response to mjc1
Here's the thing I'm most curious about, could a 69-70 (big bearing) drum brake spindle be cut down, drilled and tapped to convert it for disc brake use? The only difference between drum and disc spindles (beyond the bigger bearing 69 and up) is that boss height.
I rough measured a disc spindle from the spindle base to the upper bolt boss with a straight edge. I got 1 9/16" plus or minus a 32nd or so. Convinced it can be done, I'll try it on my leftover drum spindles, after an upcoming single piston conversion on a 69. The only limiting DIY factor will be the tap drill size as I believe it's beyond 1/2".
Having the ability to do so would eliminate another piece of the puzzle.
Did you ever try this?
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65acadian
Member
Posts: 284
Loc: Manitoba, Canada
Reg: 08-15-04
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09-30-24 09:11 PM - Post#2874326
In response to mjc1
Here's the thing I'm most curious about, could a 69-70 (big bearing) drum brake spindle be cut down, drilled and tapped to convert it for disc brake use? The only difference between drum and disc spindles (beyond the bigger bearing 69 and up) is that boss height.
I rough measured a disc spindle from the spindle base to the upper bolt boss with a straight edge. I got 1 9/16" plus or minus a 32nd or so. Convinced it can be done, I'll try it on my leftover drum spindles, after an upcoming single piston conversion on a 69. The only limiting DIY factor will be the tap drill size as I believe it's beyond 1/2".
Did you ever try this?
Edited by 65acadian on 09-30-24 09:11 PM. Reason for edit: No reason given.
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toro455
"9th Year" Gold Supporting Member
Posts: 1408
Loc: Western NY
Reg: 06-15-02
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10-01-24 06:12 AM - Post#2874331
In response to 65acadian
You do realize that the 1969-1982 Corvette spindle is exactly the same PN as the 69-70 Impala correct?
The difficult things to find are: Steering arm, caliper mounting bracket and the dust shields specific to 69 and 70 Impala.
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 BigDogSS
"16th Year" Silver Supporting Member
Posts: 5131
Loc: SoCal
Reg: 12-21-01
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10-01-24 09:44 AM - Post#2874339
In response to toro455
You do realize that the 1969-1982 Corvette spindle is exactly the same PN as the 69-70 Impala correct?
The difficult things to find are: Steering arm, caliper mounting bracket and the dust shields specific to 69 and 70 Impala.
Yes, I did know that! I actually test fitted the 69-70 disc brake bracket on a Corvette spindle AND Corvette hub + rotor.
Keep your eyes peeled at the Pick-A-Part type wrecking yards. I have found TWO 69-70 disc brake set ups over the last couple of years
1967 Chevrolet Impala SS convertible 327 - Ermine White C1 - VCCA Senior Award
1967 Chevrolet Impala SS Sport Coupe 396 - Marina Blue FF - personal "barn-find" lol
1965 Chevrolet Malibu 4D Wagon |
Edited by BigDogSS on 10-01-24 09:45 AM. Reason for edit: No reason given.
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65acadian
Member
Posts: 284
Loc: Manitoba, Canada
Reg: 08-15-04
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10-03-24 10:55 PM - Post#2874404
In response to toro455
You do realize that the 1969-1982 Corvette spindle is exactly the same PN as the 69-70 Impala correct?
The difficult things to find are: Steering arm, caliper mounting bracket and the dust shields specific to 69 and 70 Impala.
Yes I'm aware of that but my thinking was that for someone on a budget wanting to do a conversion the cheapest way would be if they could just do some work to convert their spindles. Thanks!
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