Engine Block VIN mystery

[XfireZ51]

Maybe some of you ZR-1 elders can shine a light on what Lgaff found on the back of my block. He has previously looked at Pass. side flange and found his VIN # on his 92. Today we decided to look at mine after coming back from the BBQ at Haibeck's. What we found was a number 100991-14.
My VIN ends in 474. Also there was a 6662 on the cylinder head.
When I bought the car from zipz, I was told that there had been an engine replaced under warranty at 16K miles. RKriegh had told me that all replacement motors were built as 4 bolt mains given that remaining motors were built when ZR-1 program was being discontinued and they built out rest of inventory in one final shot.
From markings on the car and VIN I know it was built on or near June 6 of 92. Any insight from the ZR-1 High Priests would be greatly appreciated.

[LGAFF]

Let me check the 92, the other blocks I checked were the 90s....#702, and #966. Not sure why they would not match the block on the 92, but will take a peek tomorrow.

[LGAFF]

There are the images from the 90s, Doms 92 had no VIN

[XfireZ51]

Originally Posted by LGAFF

Let me check the 92, the other blocks I checked were the 90s....#702, and #966. Not sure why they would not match the block on the 92, but will take a peek tomorrow.

I was under impression you had checked the 92 already.

[LGAFF]

I am wondering if 10-09-91 is the date code?

[XfireZ51]

What I thought when I saw it. Oct 91 motor build? Supposedly the guy that owned the car put up a big stink on motor replacement. However, is it possible they swapped block and kept stock top end because there's no EGR.

[LGAFF]

Looks like there may be one more place to check VIN

[Aurora40]

All replacement motors couldn't have been 4-bolts. I'm sure in 89, 90, 91, etc, they built some replacement motors anticipating the need to swap some. And I'm sure some cars got swaps before the '93 motor was even a thought.

Also, there is some stamping that identifies the block. Hib had posted this information in terms of what codes meant what years. I remember seeing it, I just can never find it... Might have been in an email on the listserv?

Edit: Here it is referred to as the "tracking number": http://www.zr1netregistry.com/ZR1_vin.htm

My 1990 has: 10ZSH

I believe this stamping should be on the driver's side, not the passenger's side where the VIN goes. Though on a replacement engine, who knows what is on the passenger's side.

[LGAFF]

Both shots from my 90 car/block are P/S

[LGAFF]

My 92 has the Vin Stamp w/ #234 on it...PS.


The number of the heads is a produciton #, mine is 5778 and the spare motor I have is in the 2K range, numbers are not sequential.