Missing Block VIN ?

[CDR]

I guess this is a VIN question not really sure. 87 GN, found matching VIN on transmission but when I got to the block it was a different story?

 

[CDR]

Block doesn't appear to have ever had a number on it? Car shows around 62k miles which I believe to be true when I purchased it rear main seal was pouring oil I replaced timing chain while at it and found it had the original also replaced motor mounts and could find no evidence of the engine ever being removed from car. Mystery I guess

 

[boostjunkie]

you may have a SG1 GM replacement block they had no vin the block will have SG1 cast in to the side

 

[GNTIM]

Posted from the TurboBuick.Com mobile app
Looks like someone hit it with a grinder...definately not machined with that finish.

 

[CDR]

Posted from the TurboBuick.Com mobile app
Looks like someone hit it with a grinder...definately not machined with that finish.

Definitely does have some scars I have to agree with you.

 

[CDR]

you may have a SG1 GM replacement block they had no vin the block will have SG1 cast in to the side

Thanks for the reply, I will look for the SG1 casting number on the block tomorrow. As ny idea where it would be located?

 

[boostjunkie]

The Casting SG1 will be on the side of the block just below the deck, i also think those grind marks look correct http://gnttype.org/techarea/pictureguides/blocks/8687SG.html

 

[TurboDave]

Very suspicious looking id pad!! To much grinding markings, and also, take look at my picture. this is my original numbers matching block. Notice mine doesn't have that hole machined into the block next to the ID pad.

 

[CDR]

Very suspicious looking id pad!! To much grinding markings, and also, take look at my picture. this is my original numbers matching block. Notice mine doesn't have that hole machined into the block next to the ID pad.

View attachment 245234

TurboDave I have to say I never noticed that before! You are correct it's completely different even the area where your VIN number is stamped appears to be much larger I'd say twice the length of this block?

 

[CDR]

SG1 block in link above does have the same hole machined in the same place haven't been out to garage yet to look for designation

 

[CDR]

The Casting SG1 will be on the side of the block just below the deck, i also think those grind marks look correct http://gnttype.org/techarea/pictureguides/blocks/8687SG.html

You were correct, had to use a mirror with a light but was able to see casting mark SG1 behind the motor mounts. Wish I new the story behind it.

 

[boostjunkie]

Very Good ! that short block may have been Dealer installed under warranty ? if i was a buyer and the non matching number block was no longer in the car i would be 100% ok with a SG1 block ! at least you now know there was no messing with the block grinding numbers off .

 

[butch2000]

are these numbers on the driver side of the block ? or pass side above the starter ?

 

[CDR]

VIN number should be stamped on the driver side of the block. SG1 is cast into the block under the motor mounts you can see them with a good light at the right angle it's hard to find but you can see them and there will be a hole cast into the block on the drivers side right above the pad if it's a SG1 block.

 

[CDR]

There'll be no VIN number if it's a SG1 block as it never came in any vehicle