ZR-1 Block Numbers

[Eric870]

Originally Posted by LGAFF

So


10ZAA X 206170003

Is this an LT-5 produced on 6/17/1992 and the third motor produced?


This is Dominics motor.....VIN stamp area does not match the car

This is the stamp were the VIN traditionally is



100991 14

Lee,

Is that a stamp on the head?

[1989ZR1#74]

Originally Posted by Eric870

My 1990 #740, the motor was built on 11/20/89 5th motor of the day.10ZSHX911200005

Question: My Build Sheet Date of my car is 89/321. Does that = 11/16/89? That is 4 day before my motor was built.

89/321 or the 321st day of 1989. This is an "ordinal" date. Since 1989 was a leap year this does in fact = November 16th, 1989. but....

That is not the date the car was actually built that was the date the sheet was printed. The lag varies, but at least you know the car was not built before that date. The LT5 production was going at full speed and the gap in time from MM to BG was very small. So I would suspect that #740 was built shortly after 11/20, say 11/21/1989 (my 21st birthday ironically enough!). The best way for you to find out when you car was built is to order the Vehicle Invoice from:

http://www.gmmediaarchive.com/

Its $50 and it tells you what date it was assembled and what date it shipped and where it went.

Eric

[1989ZR1#74]

Yes:

X=MM
2=1992
06=June
17=17th
0003=3rd LT5 assembled on 06/17

A very late 1992 I might add. Must be a VIN at the tail end of the MY.

I can't really see the stamp in the photo can you post a larger version? Is there a stamp on the Driver's side? Eric

Originally Posted by LGAFF

So


10ZAA X 206170003

Is this an LT-5 produced on 6/17/1992 and the third motor produced?


This is Dominics motor.....VIN stamp area does not match the car

This is the stamp were the VIN traditionally is



100991 14

[1989ZR1#74]

Originally Posted by LGAFF

So


10ZAA X 206170003

Is this an LT-5 produced on 6/17/1992 and the third motor produced?


This is Dominics motor.....VIN stamp area does not match the car

This is the stamp were the VIN traditionally is



100991 14

I think that the 100991 would be the casting date of the block. October 09, 1991. THis would have been the correct casting for a 1992 model year, just very early. I would suspect that the absense of a VIN may indicate that this was a service replacement, or the stamp appears lower then I would normally see. It could be that there just wasn't room for the VIN, but the 8 month lag is outside of my comfort zone making any judgements on the block.

[1989ZR1#74]

Originally Posted by bdw18_123

More LT5 stamp weirdness? My '90 ZR-1 LT5 re-stampings are still a mystery also.

Here is a recap of mine:

#2299, MM LT5 number re-stamp:




VIN cross-out & block casting date (passenger side of engine):




VIN stamp (driver side of engine):




Invoice for the car has 5/22/90 as the "PRICED" date, which I think is supposed to be the build date? And 11/22/90 is when the car was delivered to the original buyer.

Priced date is the date I am comfortable with calling the build date. Now there can be a lag. What was the shipping date? Corvettes sit for 7 to 10 days in the "hold lot" before they go "accross the fence" to the ship lot. So back 7 days off the ship date.

This one is still a mystery to me. I think it was a double Gaff. 1 at MM and 1 at BG. Remember that for evry 1 ZR-1 3 L98s were built on the line. So the engine stamper may have picked up the wrong L98 Stamp and wacked the block. Then XXX'd it out and applied the correct stamp. The MM stamp is the one I don't quite get yet, but based on our previous post on this one I am leaning that way as well. Eric

[LGAFF]

So would a Mid June built motor be for a 92 or a 93 car......2 bolt or 4 bolt main?

[1989ZR1#74]

Originally Posted by LGAFF

So would a Mid June built motor be for a 92 or a 93 car......2 bolt or 4 bolt main?

I forgot that bit:

10ZAA = 1992 350 ZR-1 DOHC 32V MT

[XfireZ51]

Originally Posted by LGAFF

So


10ZAA X 206170003

Is this an LT-5 produced on 6/17/1992 and the third motor produced?


This is Dominics motor.....VIN stamp area does not match the car

This is the stamp were the VIN traditionally is



100991 14

Whe did they start building 4 bolt main motors>

[1989ZR1#74]

Originally Posted by XfireZ51

Whe did they start building 4 bolt main motors>

1993 - 1995 4 bolts

[LGAFF]

Originally Posted by 1989ZR1#74

1993 - 1995 4 bolts

I think the question is, were the 93 motors built solely in 93 and after or was production started before......when Dominic bought the car he was told it had a service motor, but owner was not sure what year. I think the plenum indicates a 92, but were wondering if there was a possibility this could be a 4 bolt short block.