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Old 04-09-2020, 07:34 PM
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Default Need some caliper info.....

Having to rebuild one of the calipers on my 46,000 mile '72 Esprit. What was the original casting number (left side)? I'm suspicious that this one caliper has been changed before. Its number is 5474338.

And the casting date is 245. Is that 1972, 45th week or 24th week of '75?

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Old 04-09-2020, 09:20 PM
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Edit, here are a couple pics, same casting number caliper I think the date is where the "Flat blade screwdriver" mark is. For this one, Jan of 1975.

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Last edited by Formulabruce; 04-09-2020 at 10:12 PM.
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Old 04-09-2020, 10:27 PM
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Thanks. That one is the first I have seen with the screw mark in the middle of numbers. Also, mine has the date code in a different spot, on the large flat area right below the hose connection.
So since seeing yours, what do you think my '245' is if your '15' is Jan. '75?

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Old 04-09-2020, 10:37 PM
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Here's a couple pics, with & without flash.
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Old 04-09-2020, 10:42 PM
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245 = Sept. 2nd. If original, that would be '71 casting.

I thought there may be some kind of assembly stamped date too.

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Old 04-10-2020, 12:51 AM
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Quote:
Originally Posted by Held for Ransom View Post
245 = Sept. 2nd. If original, that would be '71 casting.

I thought there may be some kind of assembly stamped date too.
Thanks. I was hoping you'd chime in. The Esprit is a 10D build so 9/2 works well as likely being original.

There is a very small stamping on one of the machined flats near a mounting bolt bushing. Looks like 1278 which I assume then is 273rd day of '71. On an opposite corner flat there is a large 'E'.

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Old 04-10-2020, 06:10 AM
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1278 would be Oct. 5th 1971 (the date assembled (after machining and assembly)). Of course, if it says 273, that would be Sept. 30th. Not sure what the E stands for.

Did you find a similar stamping on the rotor?

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Old 04-10-2020, 05:39 PM
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Quote:
Originally Posted by Held for Ransom View Post
1278 would be Oct. 5th 1971 (the date assembled (after machining and assembly)). Of course, if it says 273, that would be Sept. 30th. Not sure what the E stands for.

Did you find a similar stamping on the rotor?
Typo on the caliper. Pretty sure it is an 8.

Rotor has the usual cast in numbers; 3963995 (or 996), dated J81. Then there are small stamped characters of 287T1. I interpret this as 287th day of '71 and T work station?
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Old 04-10-2020, 06:12 PM
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Also a surprise to see an original inner grease seal. Don't recall ever seeing an original on a car. Has 3 number stampings; a '2', an '8' and 5092. I looked up the full part number and it was 3965092. The '2' and '8' are spaced equally around the flange. Guessing the '2' and '8' could be dates too. Perhaps August '72.
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Old 04-11-2020, 08:47 AM
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Let me first go back and say that the 5474338 casting started in about '70/71 and went thru maybe '78, I believe.

Rotor was cast on Oct. 8th and machined and assembled on Oct. 14th.
Seal is GM original, to me, and is '5092. The other two stampings are unknown to me. Could mean 8=month and 2=day or line/machine/mold or shift (or both numbers could be reversed) or they could mean anything else.

But, I love hearing about it.

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Old 04-11-2020, 03:31 PM
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Likewise! I enjoy finding these trivial details even though not all the important since it's "only" an Esprit. But not many untouched factory installed parts on these early 'F' cars after 48 years!
Thanks for the help.

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Old 04-11-2020, 08:36 PM
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Quote:
Originally Posted by Transamric View Post
Typo on the caliper. Pretty sure it is an 8.

Rotor has the usual cast in numbers; 3963995 (or 996), dated J81. Then there are small stamped characters of 287T1. I interpret this as 287th day of '71 and T work station?
If I recall, the .965 is a "Machine Too" or minimum thickness.

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Old 04-11-2020, 09:45 PM
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Quote:
Originally Posted by necdb3 View Post
If I recall, the .965 is a "Machine Too" or minimum thickness.
The .995 (or .965) is cast in a depression by itself separate from the 7 digit casting number, and yes, that is the minimum machine to thickness.
Hadn't noticed though that the last 3 numbers are that similar.

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Old 07-24-2020, 08:18 PM
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Quote:
Originally Posted by Held for Ransom View Post
Let me first go back and say that the 5474338 casting started in about '70/71 and went thru maybe '78, I believe....
Missed this discussion first time around, checked two of my car's restoration files. Also went out & went through caliper cores as have hauled over quite a few in the last 6 months, & nearly all I originally tagged.

First ran across 5474338 (LH) 70 & 5474339 (RH) casting calipers on early production '72 F-bodys.
Back when I could find them on long time yard cars in the big country yards. For near 15 years put together a ton of '69-72 A-body disc conversions & bought quite a few D52 style calipers as cores. Some that were really clean, ended up keeping. Through the 90's, also hauled in a bunch of '71 Esprits & a few base '71 Birds. The '71 Birds, for the most part, had 5470125 (LH) & 5470126 (RH) casting calipers, same as '70 F-body's.

Original, as installed, 5474338 LH caliper dates on own longtime projects:

_81 date, original, on 03E built 72 T/A (10 day gap)
118 date, original, on May (05A?) built 73 T/A

From earlier discussion, & from examining a couple cores I have, there def was a change in the style of date of the castings. Have a B5 dated 5472378 casting caliper, assume that is Feb '75. Am very interested to see how the '74 production "338" & "339" cores are dated.

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Old 07-27-2020, 09:18 PM
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Early build '74 Formula caliper
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Old 09-25-2020, 11:31 AM
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Does anyone know what the caliper casting numbers were on a 1970 Firebird? They're for an April built Van Nuys car.

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Old 09-28-2020, 12:33 PM
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Regarding a 70 bird, I believe these to be the originals on my May built Norwood auto car.
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Old 09-28-2020, 03:14 PM
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Do you have a picture of the other side of the calipers? I have the original set that I took off my father-in-law's 1970 El Camino (he's the original owner). It was built in Van Nuys in October 1969, and the calipers have the numbers 5463636 and 5463637 cast into them. I'm wondering if they used the same calipers on the Firebird.

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Regarding a 70 bird, I believe these to be the originals on my May built Norwood auto car.
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Old 09-28-2020, 03:42 PM
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[QUOTE=eaglesan13;6182420 I have the original set that I took off my father-in-law's 1970 El Camino (he's the original owner). It was built in Van Nuys in October 1969, and the calipers have the numbers 5463636 and 5463637 cast into them. I'm wondering if they used the same calipers on the Firebird.[/QUOTE]

According to a couple Hollander Interchange manuals, your calipers fit '69 - '72 "A" & "G" Bodies only. No interchange with Firebird or Camaro. Having seen that however, I've found that often, the only difference between these very similar designs can be a slight different angle the brake hose angles off at. May require a slightly longer hose than the original.

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Old 09-28-2020, 03:48 PM
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Do you know if the correct calipers for a 1970 Firebird would have similar casting numbers, and if so, what would they be? I'm trying to help a friend identify the correct calipers for his 1970 Trans Am restoration. His original calipers were lost by his body shop.

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According to a couple Hollander Interchange manuals, your calipers fit '69 - '72 "A" & "G" Bodies only. No interchange with Firebird or Camaro. Having seen that however, I've found that often, the only difference between these very similar designs can be a slight different angle the brake hose angles off at. May require a slightly longer hose than the original.

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