Vacuum Advance Part Number?

[Christopher K.]

I'm looking at an original '73 L82 4spd distributor, 1112150.
The advance is a "524", shouldn't it be a "448"?

Thanks for any help,
Chris

[Tom H.]

Re: Vacuum Advance Part Number?

Chris:

My application book shows the 448 as correct.

[William C.]

Re: Vacuum Advance Part Number?

Delco Remy Service manual calls for 448

[Christopher K.]

Re: Vacuum Advance Part Number?

Thanks guys,
Does anyone know what a "524" is for?
Joe L?

Chris

[Joe L.]

Re: Vacuum Advance Part Number?

Thanks guys,
Does anyone know what a "524" is for?
Joe L?

Chris

Chris----

I can find no record of any vacuum control the last 3 digits of which are '524'. It's possible that one once existed of GM #1973524. If so, though, it was a PRODUCTION-only piece. Are you sure the number is '524'?

[William C.]

Re: Vacuum Advance Part Number?

I'm with Joe, I looked at all the oem GM Vacuum cans in the 1963-77 timeframe and found no "524"

[Christopher K.]

Re: Vacuum Advance Part Number?

Thanks Joe and Bill (and Tom!),

Seller rechecked numbers and says it's definitely 524.
He pulled it from his original '73 L82 4spd, tag says 3 A 22.
He said it looked like it "hasn't been messed with"

Joe, is that 524 part number for a 15 degree vacuum advance, like the
"448 15" ?

Chris

[Joe L.]

Re: Vacuum Advance Part Number?

Thanks Joe and Bill (and Tom!),

Seller rechecked numbers and says it's definitely 524.
He pulled it from his original '73 L82 4spd, tag says 3 A 22.
He said it looked like it "hasn't been messed with"

Joe, is that 524 part number for a 15 degree vacuum advance, like the
"448 15" ?

Chris

Chris-----


I don't have any information, at all, on the '524'. I don't even know if it actually existed, although the situation here is pretty good proof that it did exist. I just theorized that it MIGHT have existed since GM #1973523 and GM #1973525 were once distributor vacuum controls that did exist. So, it's very possible that there was once one "in between". However, if there was, it was never available as a SERVICE part and I have absolutely no information on it.

As I mentioned, it is possible that it was a PRODUCTION-only piece that was used alternatively with the GM #1973448. In fact, if the distributor is of GM #1112150 and appears to be "un-messed with" and given that it's, apparently, a 15 degree vacuum control, then I strongly suspect this is what it is. I have no information to support that, though. It's just a hunch based upon what I have found. IF my hunch is correct, I would expect this control to have the same or virtually the same specs as the 1973448.

[Christopher K.]

Re: Vacuum Advance Part Number?

Thanks Joe, that's great info. If I end up getting it, I'll post a picture.

Chris

[Christopher K.]

Re: Vacuum Advance Part Number?

Well, the plot thickens. You just never know what's next...

Seller told me the only other numbers on the vac advance were CCW - So he was talking about the CAM and WEIGHT PLATE! (which looks correct to me)

I had him look at the "cone shaped vac advance" and he says it reads
437 15

In my parts book that is part #1973437 for a '71-'72 350 w/1112038-50.
That's a for an Lt-1 engine, I believe.

Any thoughts on this vac can. Could it have been put on a '73 L82 in production?

Thanks,
Chris

[William C.]

Re: Vacuum Advance Part Number?

The vacuum advance was part of the emissions certification in 1973. The chances of an incorrect one leaving the plant, somewhere near zero.

[Christopher K.]

Re: Vacuum Advance Part Number?

Thanks Bill,

Anyone can put a tag on a distributor, I think I'll wait for one with ALL the correct numbers.

Chris

[Wayne M.]

Re: Vacuum Advance Part Number?

.... Seller told me the only other numbers on the vac advance were CCW - So he was talking about the CAM and WEIGHT PLATE! (which looks correct to me)

I had him look at the "cone shaped vac advance" and he says it reads
437 15

In my parts book that is part #1973437 for a '71-'72 350 w/1112038-50.
That's a for an Lt-1 engine, I believe...

Chris -- while you're waiting for "all" the numbers, your analysis seems correct to me (ie. the 437 can on the 2038 / 2050).

For example, I have a 1971 LT1 "2038"_0-J-3 date, also with the 437_15 can (no MS on the first line). So seller is reading the rotating weight plate, with "524_CCW" stamped (on top or bottom ? I've seen both locations). My "2038" weight plate is stamped "534" (no CCW) on top. Ask him to see if there's a stamped number on the shaft's autocam (ie. football). My "2038" is stamped '170W' on the underside (or sometimes the cams are stamped with 2 or 3 digits on top, or sometimes underlined).

So there's quite a few numbers to totally define a distrib. Would be nice if someone with a '73 "2150" could chime in with their numbers.

[Christopher K.]

Re: Vacuum Advance Part Number?

Thanks Wayne,
Great info

Chris