Section 5 in the Specifications at the back had (or would have had) some additional data, including torques and nominal dimensions of the brake drums and shoes... It seems the '68 SM had a glitch (either in the initial release or ??)..
Gary, it would be good to have the charts that are in the 67 and 69 for quick reference, especially the torque chart. I compared page 5-21 that Steve mentions in the 68 SM, and it is virtually the same as 5-22 in the 67 SM.
Think maybe the same guy that decided we didn't need options listed on the cowl tag in 68 was in charge of the SM?
I've already returned my manuals to their 'basement' storage spot..
, but I recall that the 'brake drum' information in the main Section 5 was the same information in the '67 and '69 manuals. In the Specifications (at the back of the SM), the '67 manual contained separate charts for 'Torque Settings' and 'Brakes', but the '69 manual combined this information into a single chart (which I scanned and posted on an earlier post). A quick review of those two charts did not indicate any differences in the information, just that the two charts were combined into ONE for the '69 manual. I think from this you'd be safe to rely on information from either the '67 or '69 SMs to obtain data for your '68. If you really want the two charts from the '67 manual page, let me know and I will retrieve that manual page and scan/post it..
Going back thru the messages I see that Pete had already posted the two charts from the '67 manual, so you have access to the Specs section for Brakes from both the '67 and '69 manuals. I'm suspecting that the '68 manuals that some of you have simply had an error for that page to be missing in the specs section (but it should contain the same information as either of the other manuals, unless the '68 was unique and different, which i don't think would be true).
PS. In an earlier reply in this thread, I posted these comments:
"The drum itself will have a specification stamped into it; how much it can be turned down is generally stamped into the back edge of the drum.
There is also a angle cut on the back inner edge of the brake surface, which can be used as a quick indication of how much it could be turned down..."
On further reflection this might be incorrect: I was citing data from my front disk rotor, which was the item I most recently had turned. It's been so long since I turned a rear drum, that I have to renege on that comment above, as I have no idea if diameter/spec data were ever stamped into drums. Maybe someone else can clarify that issue?