<VV> Question about '63-'64 rear brake drums

[Frank DuVal]

First and foremost, the acceptable limit of drums is .060", so only one 
of yours needs replacing.

Only have a drum turned if there is excessive grooving or warping. There 
are no new replacements of these drums at the moment. Clark's lists 63 
rear aftermarket drums, but they are out of stock now. They have not 
listed 64 rear drums in YEARS!

There is a backing plate change, so 64 drums may not fit your 63 backing 
plates. Same for front drums. Slip one on and try it. The larger OD of 
the 64 is because there is a extra lip on the drum, not because there is 
more meat on it. This lip must clear the backing plate.

The backing plate also changes 62 to 63, because the axle bearing 
changes from sheet metal housing to cast housing.

All the other brake parts are the same 63 to 64.

I can tell you a friend had a .090" oversize drum on his 63 and the 
shoes fit fine, stopped fine when he first bought it. Who knows how many 
miles it took to wear the shoes to the large drum . But, Maryland state 
inspection measured it (they are through on initial buying inspection)  
and flunked it.

.050" oversize should last you a long time.

I do not consider changing the front drums to 64 style to be any 
upgrade. Same shoe square inches, same non finned surface, same wheel 
bearings, just an extra lip.

Frank DuVal

On 10/6/2016 2:17 PM, Nick R via VirtualVairs wrote:
> Hi
> My '63 rear brake drums are worn at about 9.04" & 9.09" diameter. They've
> already been turned. I think that the '63's may be out of acceptable
> tolerance since I think acceptable is less than 9.05". I have some 1964
> rear brake drums with the fins that measure 9.03" or less which would be
> well within tolerances plus they're already turned smooth. I would like to
> upgrade to the '64's onto my '63. Can anyone verify that this swap will not
> cause any conflict with the remaining 1963 rear brake components? The '64's
> have the same I.D. but the O.D. of the '64's is quite a bit larger. The
> backing plates might be different. Does anyone here know one way or the
> other?
>
> Next will be my front drums, I wonder if I should look into upgrading the
> fronts to 1964's which are larger O.D. and the same I.D. as the '63's. I
> only have one '64 and it measures 9.03" so I would need to find another '64
> front hub and drum if I went that way.
>
> Thanks for the help, Nick
>   _______________________________________________
> This message was sent by the VirtualVairs mailing list, all copyrights are the property
> of the writer, please attribute properly. For help, mailto:vv-help at corvair.org
> This list sponsored by the Corvair Society of America, http://www.corvair.org/
> Post messages to: VirtualVairs at corvair.org
> Change your options: http://www.vv.corvair.org/mailman/options/virtualvairs
> Archives: http://www.vv.corvair.org/archive.htm
>   _______________________________________________
>