'70 Chevelle Front Rotors
 

A front and rear brake overhaul is next on my list for my '70 SS Chevelle and I found I have one two piece rotor and one one piece rotor on my car. Can someone educate me in what is correct for a '70 SS and who would be the best supplier to buy a couple of new rotors from?
Thanks in advance.

Re: '70 Chevelle Front Rotors
 

Two piece rotors are correct.....there are definetely originals out there.....however, you need to purchase them from a trustworthy source.....I believe the min. thickness is .95-.96.

You can also purchase a repop.....as they are repoping them now.

http://www.ss396.com/chevelle/FBR-2P.html

Dan

Re: '70 Chevelle Front Rotors
 

Thanks Dan, I didn't know someone had started making them again.

Re: '70 Chevelle Front Rotors
 

Where was your Chevelle assembled and on what date?
Chevelles built within the first 5/6 mos.of production received 2pc. rotors.
1pc. rotors became the norm within the months following that.
Jan/Feb.70 seems to be the changeover date,but with 7 plants building them,there were variations among them from what I've seen.
The steering knuckle code in box #12 on your buildsheet helps denote this,as well as the backing plate used.

Re: '70 Chevelle Front Rotors
 

Two piece rotors were used up until around I believe January of 1970.. After that they went to a one piece and used a different backing plate as well. The one piece rotors also had a single groove cut in the middle of the face of the rotor.

Re: '70 Chevelle Front Rotors
 

Great Info Rick and Rick

Re: '70 Chevelle Front Rotors
 

I'm not 100% on the build date as the cowl tag looks like it's been on and off the car. Can't quite make it out definitively but if I had to guess I'd say it is 12B rather than 02B. Happy to have any input?

http://i1216.photobucket.com/albums/...pszsfyfu5e.jpg

http://i1216.photobucket.com/albums/...psbwmcqu2l.jpg

Re: '70 Chevelle Front Rotors
 

Damien,
If your car has it's original front backing plates they will tell which style rotor was on the car.
If the car has # 5463496 & 5463497 it had 2 piece rotors.
If the numbers stamped on the backing plates are 5463565 & 5463566 then it had 1 piece rotors.
All this info is useless if the plates are not original to the car.
The other way to know which style the car came with can be found on the build sheet of the car if you have one.
From memory I believe codes AS and DK are 2 piece codes and DT is 1 piece. I am traveling right now and can't reference my build sheet collection right now.
I would lean towards 2 piece rotors if your cowl tag date is 12 B but it could go either way in my opinion if it's 02 B.
I have seen cars built into March of 70 with 2 piece rotors.
My February built LS6 convert from the Baltimore plant has 2 piece rotors.
Hope this helps.
Chris

Re: '70 Chevelle Front Rotors
 

Great info Chris....since we are on the topic of early and later built '70`s......Damien also take a look at your tail lenses. Are they the early style - flat lenses? The same with your hood....is your hood an early hood? Take some pictures of the underside front portion of your hood and post them...again this only applies if your hood and tail lenses are original.

Plus I see your Chevelle has the lower trim under the front headlight bezels....another part found on early built Chevelles.....perhaps we will see a pattern here [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Dan

Re: '70 Chevelle Front Rotors
 

You can post or PM me your VIN which will also tell me approximately when it was built. If the blue VIN decal is still on the drivers door that will also give you the build date which is in the upper right corner of the decal.

Re: '70 Chevelle Front Rotors
 

Thank you guys, some greta info there that I will check into and post some pics and info. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Re: '70 Chevelle Front Rotors
 

You are welcome.....This is what this great web site is all about [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Looking forward to your pictures [img]<<GRAEMLIN_URL>>/headbang.gif[/img]

Dan

Re: '70 Chevelle Front Rotors
 

PM sent Rick.
Thank you.

Re: '70 Chevelle Front Rotors
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Ls6 Ragtop</div><div class="ubbcode-body">Damien,
If your car has it's original front backing plates they will tell which style rotor was on the car.
If the car has # 5463496 &amp; 5463497 it had 2 piece rotors.
If the numbers stamped on the backing plates are 5463565 &amp; 5463566 then it had 1 piece rotors.
All this info is useless if the plates are not original to the car.
The other way to know which style the car came with can be found on the build sheet of the car if you have one.
From memory I believe codes AS and DK are 2 piece codes and DT is 1 piece. I am traveling right now and can't reference my build sheet collection right now.
I would lean towards 2 piece rotors if your cowl tag date is 12 B but it could go either way in my opinion if it's 02 B.
I have seen cars built into March of 70 with 2 piece rotors.
My February built LS6 convert from the Baltimore plant has 2 piece rotors.
Hope this helps.
Chris </div></div>

Chris, I managed to find the 5463496 and what looks to be an L on the driver's side backing plate, but unable to get a decent pic though. So it looks like it had two piece rotors.
Thanks very much, you were a great help. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Re: '70 Chevelle Front Rotors
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Postsedan</div><div class="ubbcode-body">Great info Chris....since we are on the topic of early and later built '70`s......Damien also take a look at your tail lenses. Are they the early style - flat lenses? The same with your hood....is your hood an early hood? Take some pictures of the underside front portion of your hood and post them...again this only applies if your hood and tail lenses are original.

Plus I see your Chevelle has the lower trim under the front headlight bezels....another part found on early built Chevelles.....perhaps we will see a pattern here [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Dan </div></div>

Dan, I think you are correct.
Even though it has the round tail lenses rather than the flat, that may well have been swapped out at some stage, it looks to have an early style hood with the smaller triangulated inner structure?

Hood

http://i1216.photobucket.com/albums/...pssew5kkf4.jpg

Tail lense

http://i1216.photobucket.com/albums/...pstpjk40md.jpg

Re: '70 Chevelle Front Rotors
 

Great! You need a set of 2 piece rotors and a set of flat rear lenses to make her complete [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Well done.

Dan

Re: '70 Chevelle Front Rotors
 

On the list Dan. Thanks for your input as usual. Big thanks also to Rick Nelson. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]
Great site here. [img]<<GRAEMLIN_URL>>/youguysrock.gif[/img]

Re: '70 Chevelle Front Rotors
 

Jefferson is coming up next month. If I find any early lenses....they are yours.

Dan

Re: '70 Chevelle Front Rotors
 

Thanks Dan. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Re: '70 Chevelle Front Rotors
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Postsedan</div><div class="ubbcode-body">Jefferson is coming up next month. If I find any early lenses....they are yours.

Dan </div></div>

Check the parts for sale section here. [img]<<GRAEMLIN_URL>>/naughty.gif[/img]

Re: '70 Chevelle Front Rotors
 

Hey Guys great info.
I just checked my Build sheets from 1970 Chevelles and I have a few &quot;AS&quot; coded in box #12 (Steering Knuckle) that are dated from April.
The latest being my own former LS6 car that had a scheduled date of April 23, the next date I found is April 16 and so on.

Some of you mentioned January as the change over date but there are many that are in February March and April.
Maybe the average date was January/February from most plants before switching over to the one piece but there are many going into cars as late as April especially the Atlanta Plant were I have many with &quot;AS&quot; but they did indeed switch over to the 2 piece rotors as of May as all my May build sheets have &quot;DT&quot; for the Atlanta Plant, on average the other plants are earlier.

My Ls6 Built on April 23 1970 did have the original 2 piece rotors with the correct backing plates of 5463496 &amp; 5463497

Re: '70 Chevelle Front Rotors
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: XXXBlackLs6M22</div><div class="ubbcode-body">they did indeed switch over to the 2 piece rotors as of May as all my May build sheets have &quot;DT&quot; for the Atlanta Plant, on average the other plants are earlier
</div></div>

In the above comment it is supposed to be a 1 not a 2 piece rotor from this quote. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img] Went to change it but ran out of edit time.

Re: '70 Chevelle Front Rotors
 

My 1970 Canadian built Chevelle has a built date of January 12, 1970 and has the # 5463496 &amp; 5463497 backing plates.

Re: '70 Chevelle Front Rotors
 

if you buy the re popped 2 piece rotors (they are Nice) I have bought two pair. ..check them for being straight..3 out of 4 required a cut to be true..prob from drop! shipping!

Re: '70 Chevelle Front Rotors
 

I have also used the repops and they are very nice. I used the original hat from the car and the repop rotor, had them recut correctly and they were a perfect bolt on with no issues and look OEM.

Re: '70 Chevelle Front Rotors
 

is there more than one place repoping these?
thought there was a good and a bad one out there.

Re: '70 Chevelle Front Rotors
 

Thanks for all the replies. I am going to go with a pair of the repop 2 piece rotors.

Re: '70 Chevelle Front Rotors
 

Does anyone know if the rotor info applies to other GM cars of the era such as Camaro and Nova? I've got a 1967 Camaro I'm going to need rotors for.

Re: '70 Chevelle Front Rotors
 

1967-69 Camaro &amp; 1967-70 Chevelle &amp; Nova all shared the same 2 pc. rotor.