ZR-1 Block Numbers

[1989ZR1#74]

Originally Posted by bdw18_123

The "SHIPPED" date is 5/24/90, only 2 days after the "PRICED" date. Couldn't have sat for 7 days, could it? "INVOICE" date is also 5/24/90.

You're probably right about the re-stamps just being a screw up. Just so happened that both plants messed up on the same car! But still seems strange for there to be such a big gap between the block casting date (03/07/90) and the build/priced date (5/22/90), especially since ZR-1's were in high demand at the time. Over 2 and a half months.

On the MM stamp, they didn't completely grind out the original number, you can still make out part of the original numbers. I'm pretty sure that the last 4 digits were "2299", which would match the last 4 of the VIN. Interesting mistake for them to make, would mean they knew that this LT5 was going to be for 2299.

They put them in a hold lot for 7 to 10 days incase they find something on the line during that time they can repair the ones in the Hold Lot.

The build date is really a moving target as the car isn't built instantly. You really sort of have to settle on a range. I would guess the car left the plant (meaning drove outside) 7 - 10 days prior to shipping. So probably the 5/17 time frame. The VIN number on the Boss seems almost impossible given the type of number the MM stamp is. They would only have to change the last digit maybe two on the stamp. Although if I had to guess since this is block #1 on Tuesday May 15th 1990, The stamper forgot do index the stamp forward by one day. Probably had a X0051400XX number. (although that would not show 2299 on it now would it.) Eric

[1989ZR1#74]

Originally Posted by LGAFF

D/sFront of block




D/sFront of Girdle

The Girdle and the Block are two different parts.

If so are they machined together, or matched in any way?

The theory I would have are:

1: They are matched and they would need to live out their lives together so they assign some arbitrary sequence number like the heads on 1989 #058:






My bet it was simply some kind of MM internal number assigned to a replacement block. Like the numbers on the heads.

[LGAFF]

I think we have to many topics going at once on this thread, the 1059 stamp is from the 90 #702....that one if the original motor.

[1989ZR1#74]

Originally Posted by LGAFF

I think we have to many topics going at once on this thread, the 1059 stamp is from the 90 #702....that one if the original motor.

Yikes, sorry about the confusion. I am all mixed up.. OK not sure what that number is only theory #1 would apply:

"1: They are matched and they would need to live out their lives together so they assign some arbitrary sequence number like the heads on 1989 #058:"

[1989ZR1#74]

So this thread has:

#1: 1G1YZ23J8L5800702 LT5, Part#10153558, Block cast date of 10/03/1989 With 1059 stamped in Girdle and Block

Question: what does the 1059 mean?

#2: Dominic's 10ZAA X 206170003 LT5 with a cast date of 10/09/1991 This is identified as a service replacement without a VIN stamp.

Question: is it a 4 bolt?

#3: Eric870's 1G1YZ23J5L5800740, MM Stamp 10ZSH X 911200005,

Question: Build sheet date is before MM LT5 stamp date?
Answer: Since the date is when it was printed and not assembled, it is possible for the build sheet to be dated before the LT5 was assembled.

#4 bdw18_123's 1G1YZ23J6L5802299, MM Stamp 10ZSH X 005150001 Restamp.

Question: Why is both the VIN and the MM stamp "Restamped"?

[1989ZR1#74]

Ok as far as the #1059 I found this in the April 1989 issue of Corvette Fever:



So they were matched, and almost all of the matched parts recieved serial "unique serial numbers" Could be why....

[A26B]

For reference, there are good pictures of just about every LT5 part on the http://www.jerrysgaskets.com website.