73 disc brake rotors

["Jim Stacey" <jstacey@xxxxxxxxxxx>]

Thanks very much for this tip. You're right on.  The rotors NAPA lists for C
bodies have a 4 1/2" bolt circle.  My Imperial rotor has a 5" bolt circle.
This will help a lot in narrowing my search.

BTW, I found a nifty web page for calculating bolt circle diameters for
5-bolt wheels by measuring the distance between two adjacent holes:

http://www.midatlanticmotorsport.com/bolt_circles.htm

Jim

-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx]On Behalf Of Otis Davidson
Sent: Friday, March 29, 2002 6:20 PM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: Re: IML: 73 disc brake rotors


Be careful when buying rotors for your '73 Imp. They had a larger
bolt-pattern than the C bodies.

----Original Message Follows----
From: "Jim Stacey" <jstacey@xxxxxxxxxxx>
Reply-To: mailing-list@xxxxxxxxxxxxxxxx
To: "Imperial club mail list" <mailing-list@xxxxxxxxxxxxxxxx>
Subject: IML: 73 disc brake rotors
Date: Fri, 29 Mar 2002 20:28:40 -0800

All,

It was nice enough outside today up here in Ontario to pull the rotors off
the '73 that I'm bringing back to life and check to see if they meet minimum
thickness.  They do not. Minimum (discard spec) is 1 3/16 and these are less
than that.

My local Canadian Tire lists brake parts for New Yorker not Imperial, but my
'73 parts catalog indicates the Imperial rotors are a different part number
than for C-body (Y=3580 522 C=3683 969).  The caliper and pads however are
the same for Y & C bodies - thank goodness. I can get these locally.

NAPA seems to agree since I can find New Yorker rotors on NAPA but no
listing for Imperial.  I see you can email NAPA with special hard-to-find
requests, but thought I'd try the club first.

I was wondering if anyone with a '72 or '73 (or possibly earlier model, I
don't have an interchange manual) has had any experience buying rotors, and
if so, where they got them.  Will the C body rotor work by any chance?

Frank Mitchell lists one in stock on parts voice, but I think he would be a
last resort.  Besides, I need two not one.

Any help would be appreciated.

Thanks,

Jim Stacey
'73 4drht in 1000 pieces
near Toronto