ZR-1 Block Numbers - ZR-1 Net Registry Forums

LGAFF · 06-13-2010

Not sure if these are posted or not...

ZR-1 Block #s

10090511...350.....90....2...LT-5, ZR1 Vette, 375hp

10153558...350...91-92...4...LT-5, ZR1 Vette, 375hp

10199001...350...93-95...4...LT-5, ZR1 Vette, 405hp

LGAFF · 06-13-2010

I thought this might help in decoding Dominic's block, but I did not find this referenced on the spare block that I have.

It has 10ZSH 91100015 on the side.

I did notice on the front drivers side it is numbered with 1059...I am wondering if this is the sequence of LT-5s built...the car is # 702 so its possible.

XfireZ51 · 06-13-2010

Lee,

Maybe Gordon Killebrew could be of help on this.
Didn't my block have the 9001 number?

LGAFF · 06-13-2010

Found it, the 90 actually has a 91 block stamp 10153558

Also Block and Girdle are mated with the same stamped # 1059

1989ZR1#74 · 06-14-2010

10ZSH 91100015 ??

10ZSH: 1990 MY 375HP/350CI, Manual Transmission Electronic A/C

91100015 is short 2 digits. Are you sure that's the number?

It should start with an X for MM Stilwater
last 4 are that days sequence, but the date derivative can't be right.
So should look something like this:

X911100015:
X = MM
9 = 1989
11 = November
10 = 10th
0015 = 15th LT5 assembled that day.

Eric

LGAFF · 06-14-2010

I will look, does your motor have matching stamps on the block and girdle?

Date Stamp from #702

Eric870 · 06-14-2010

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.

1989ZR1#74 · 06-14-2010

Quote:

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

-=Jeff=- · 06-15-2010

just drop the pan already..

A26B · 06-15-2010

Look at the front cover to tell if it is a 4 bolt main engine. Lwr corner, driver side rounded = 375 hp 2 bolt, square = 405 4bolt.

06-13-2010	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	ZR-1 Block Numbers Not sure if these are posted or not... ZR-1 Block #s 10090511...350.....90....2...LT-5, ZR1 Vette, 375hp 10153558...350...91-92...4...LT-5, ZR1 Vette, 375hp 10199001...350...93-95...4...LT-5, ZR1 Vette, 405hp __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

06-13-2010	#2
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: ZR-1 Block Numbers I thought this might help in decoding Dominic's block, but I did not find this referenced on the spare block that I have. It has 10ZSH 91100015 on the side. I did notice on the front drivers side it is numbered with 1059...I am wondering if this is the sequence of LT-5s built...the car is # 702 so its possible. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

06-13-2010	#3
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,709	Re: ZR-1 Block Numbers Lee, Maybe Gordon Killebrew could be of help on this. Didn't my block have the 9001 number?

06-13-2010	#4
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: ZR-1 Block Numbers Found it, the 90 actually has a 91 block stamp 10153558 Also Block and Girdle are mated with the same stamped # 1059 __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 06-13-2010 at 11:34 PM.

06-14-2010	#5
1989ZR1#74 Join Date: Jan 2009 Location: Scottsdale, AZ Posts: 700	Re: ZR-1 Block Numbers 10ZSH 91100015 ?? 10ZSH: 1990 MY 375HP/350CI, Manual Transmission Electronic A/C 91100015 is short 2 digits. Are you sure that's the number? It should start with an X for MM Stilwater last 4 are that days sequence, but the date derivative can't be right. So should look something like this: X911100015: X = MM 9 = 1989 11 = November 10 = 10th 0015 = 15th LT5 assembled that day. Eric __________________ 1989 ZR-1 #04 Pilot, Advertising/PR Campbell-Ewald S9YKH1 1989 ZR-1 #58 LT5 only 1989 ZR-1 #74 Unreleased Production / PR Dept 9PR110 NCRS #3,182 SACC #2,420 Member Corvette Museum Corvette Forum: "ewjxn" 2009, 2010 Gathering Attendee Last edited by 1989ZR1#74; 06-14-2010 at 01:35 PM.

06-14-2010	#6
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: ZR-1 Block Numbers I will look, does your motor have matching stamps on the block and girdle? Date Stamp from #702 __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 06-14-2010 at 03:06 PM.

06-14-2010	#7
Eric870 Join Date: Apr 2009 Location: Portland OR Posts: 173	Re: ZR-1 Block Numbers 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.

06-15-2010	#9
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,169	Re: ZR-1 Block Numbers just drop the pan already.. __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

06-15-2010	#10
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,394	Re: ZR-1 Block Numbers Look at the front cover to tell if it is a 4 bolt main engine. Lwr corner, driver side rounded = 375 hp 2 bolt, square = 405 4bolt. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.