[Judge273]

Things flash rust in Memphis before you get a protectant on it....haha

The lugs in question were from Blls car originally and are solid chrome plated. That's why they are rusty. Craig is looking for the ones he has from Bill.

Will post later...

I have seen the ones Chad posted before, and heard of early black center lugs. Never saw these before.

[TA455HO]

Mike, not casting stones here, but tell me about the rear drums. They look great but I didn't think they used the finned drums until 1973. The smooth drums were used on Firebird, Chevelle, Camaro, etc. and ones I've seen have a casting number of 3993560. Not a big deal, one of those things you don't see much once installed, just was curious what you know about them and maybe the front disks, too. Did you get the date coded NOS disks he mentioned?

.

[Judge273]

Chad, The NOS rotors were sold about the same time the nos heat shroud too. Not sure on finned drums as that's a good question.

[SD455DJ]

Here's an original '71 rear brake drum...finless.

Dennis

[TA455HO]

That looks like correct style. I would love to zoom in on about the 1 o'clock position and see if that is casting number 3993560. Looks like it probably is.

Edit: I saved off a copy of your picture and zoomed in and rotated it 180 degrees and that does seem to be the casting number all right. Tell me if you disagree.



3993560 right about there ^^

.

[Judge273]

I'd say it's clear...part number and tag too. That's documentation!

[Bentwheelbob]

Here's a couple media blasted bare metal parts with RPM applied.

[TA455HO]

Originally Posted by Judge273

I'd say it's clear...part number and tag too. That's documentation!

That's the casting number on the outside of the drum. Often, but not always, different than the part number.

Consider something like the water pump for the 1971. Assembly part number is 9790522. But it's made up of several individual parts. Impeller, shaft, bearings, seals and the main housing. The main housing might have a casting number like 482138, but if you try to use that number to look it up you typically won't get anything.

One of the more extreme examples is a carb. We might know it as part number 7041267, but it is made up of a few individual castings, jets, float, etc.. Actual stocking part number would be different than that.

You get the idea. I just didn't want you chasing your tail any more than any of us might usually do. Part numbers can refer to one or more casting numbers. In the case of the brake drums it is a one to one relationship.

Oh, and if Lloyd or someone refers to their MPC they might come up with a drum part number for 1970 and 1971 of 3841176. So you might be inclined to think that must be the part number for the 3993560 casting number. Unfortunately, not the case as the part number 3841176 has a casting number of 3841177 as seen here - and that is a pretty penny for each rear drum.


http://www.oldsobsolete.com/products...m-nos-3841176/

.

.

[SD455DJ]

Originally Posted by TA455HO

That looks like correct style. I would love to zoom in on about the 1 o'clock position and see if that is casting number 3993560. Looks like it probably is.

Edit: I saved off a copy of your picture and zoomed in and rotated it 180 degrees and that does seem to be the casting number all right. Tell me if you disagree.



3993560 right about there ^^

.

Chad, You are correct, that is the casting number 3993560. Dennis

[Judge273]

I need those now...