Need help with 13" corvette swap!!!!! - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

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post #1 of 17 (permalink) Old Jan 24th, 02, 04:57 PM Thread Starter
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i have read every post on this page and also Pro-touring.com and can not find anything that helps. Everyone says this should work, but it clearly has some problems. I have the 13" rotors,matching calipers, and I bought the brackets from GM. I made the adapter plate from 1/4" steel and when i mounted everything together the caliper bracket and adapter plate are flush with each other. ( See attached picture.)I think I have some additional machining to do. Has anyone seen this? Please HELP!!!
http://www.touringcamaro.com/index/bracket.jpg

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post #2 of 17 (permalink) Old Jan 24th, 02, 05:15 PM
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did you use a drum brake spindle? if you did, did you machine the top boss down to be even with the bottom bosses? what are the hubs from? when i was wandering around the boneyard, i found that different GM cars have hubs with different offsets, but the same bearings and bolt patterns. if you are using camaro hubs, they should be right.

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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels
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[This message has been edited by novaderrik (edited 01-24-2002).]
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post #3 of 17 (permalink) Old Jan 25th, 02, 10:00 AM Thread Starter
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I have machined the upper boss down and am using the original drum brake hubs. It seems the only way it will work is if I machine material away from the caliper bracket and also another 1/8" from both the upper and lower boss. I am worried this will weaken these parts too much. It looks like I will have to make a custom bracket to get everything to line up. i would definitely buy this one is someone makes it.


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post #4 of 17 (permalink) Old Jan 25th, 02, 10:57 AM
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Do you mount the bracket on the inside of the made bracket or the outside? I'm doing the 13" rotor thing too, but I'm using a truck single piston caliper. How did you chop down your upper mounting boss? Which bolts up fine to a flat piece.

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68 468 700R4, and here it is;
mutert23
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post #5 of 17 (permalink) Old Jan 25th, 02, 11:06 AM
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Hello !
I want to do the same swap and I already own the same parts.
I have a plastic model just in front of me and I think itīs 10 mm from the spindle to the Corvette bracket.
But I will use the disc spindles (and hubs) and here is the lower bracket bolt closer to the disc. So I will use another bolt for the upper thread with a spacer to match the same level.
I have to do some milling at the outer diameter of the hub, because the disc doesnīt hit the surface from the hub.
But it should work. I already installed the plastic model to check all necessary clearences.
Sorry, I donīt know the drum brake setup exactly.

MK


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post #6 of 17 (permalink) Old Jan 25th, 02, 01:15 PM Thread Starter
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markm-
I thought you were supposed to mount them on the outside (ie.)between the bracket and the rotor) i am going to look at it some more tomorrow and see what I can come up with. I just got a digital caliper from a friend and i am going to draw up a bracket on AutoCAD to take to a machine shop to make the correct brackets. I'll let you know. Also check my webpage under restoration/suspension.



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post #7 of 17 (permalink) Old Jan 25th, 02, 07:01 PM
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Tetoe jones has brackets allready made and laser cut for fifty bucks, if memory serves...
There is another guy who has them too for about the same price.
David
Here is a photo from my web page for reference. I don't know what is wrong here. it should work unless your hub is different somehow?


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[This message has been edited by davidpozzi (edited 01-25-2002).]
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post #8 of 17 (permalink) Old Jan 25th, 02, 07:34 PM Thread Starter
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this picture shows the 12" rotor. For some reason the 13" is different. it does not line up like it is supposed too. I am pretty sure the "bracket" will not work. i got an email from someone who told me that bracket didn't work and that he made a custom bracket to line every thing up. I'll let you know when i get someting that works....

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post #9 of 17 (permalink) Old Jan 26th, 02, 09:04 AM
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maybe you could machine the spindle more. machine both the top and bottom bosses down an extra 1/4 inch or whatever it needs. would a wheel spacer work behind the rotor?
maybe the extra thickness of the rotor is what makes this happen- it is about a half inch wider, which would be 1/4 inch on both sides.
what is the oem application of the rotors? maybe there are some differences we don't know about yet.


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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels
see pics here http://community.webshots.com/user/novaderrik
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post #10 of 17 (permalink) Old Jan 26th, 02, 10:34 AM Thread Starter
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I think your right about the rotor thickness. That is probably it. I thought about machining the gm caliper bracket down. it looks to be the easiest piece to machine. I think it will work. I also thought about the a spacer but I am running the ZR-1 wheels and am already going to run a pretty large adapter up front. I don't want to add anymore stress to studs. I will probably go to machine shop Monday and see if i can take care of it. I'll keep you posted.

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post #11 of 17 (permalink) Old Jan 26th, 02, 02:19 PM
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My 13" conversion using my homemade caliper brackets fit fine.

1988 13" Corvette front rotor, my drum hub machined down to fit the rotor hat and kissed at the center.
1972 and up truck big single piston caliper.

And my bracket.

I'm working with two guy's to market both this one and a rear bracket to mount a 11.75" 1989 Camaro rear rotor and a 1980 Seville Cad. e-brake caliper to 10, 12 and 8.5" rearends.

I will post their names and addresses if anybody wants to get them after we finish the brackets. pdq67



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post #12 of 17 (permalink) Old Jan 27th, 02, 09:02 AM
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I had the same problem with 13" swap.What you have to do is machine down or grind down the caliper bracket mounting bosses allmast flat ( Whatewer clearences needed) that goes on the bracket you made. This is what I did for 13" convertion.
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post #13 of 17 (permalink) Old Jan 27th, 02, 09:33 AM
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Ismail,
thanks for the info. This is a new problem to me!
By the way, Dorman sells replacement caliper bridges now.
David

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post #14 of 17 (permalink) Old Jan 27th, 02, 10:29 AM
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David,
By replacement caliper bridges, do you mean the cast-iron caliper nest that bolts to the bracket or spindle? pdq67



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post #15 of 17 (permalink) Old Feb 7th, 02, 06:39 AM
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Did you guys come up with a solution for this problem yet? Thanks

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