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longhorn70gmc · 03-25-2006, 02:43 PM

Hello all,
Been a while. I need some help? My engine was rebuilt by the previous owner and my block number is no longer stamped where it should be. I found the Bureau of Automotive repair/engine Identification tag.
Is there a way to decode this to discover what the original block number was? OR
Is there a place I can go to research it here on the web? I did go to the Bureau's site and it was not helpful.
Thanks for the help!!
Respectfully

**VetteVet** · 03-25-2006, 05:09 PM

Everybody will tell you to look on the block on the left side rear of the engine and you will see a casting number. It will look like this ( 3970010 ) if it is still there . The numbers are about a 1/2 inch long and should be easy to see after you clean the crud off. When you can read them then go to this website,http://www.mortec.com/.

longhorn70gmc · 03-27-2006, 12:01 AM

Thanks for the info. I thought the number was on the front only. I will look and get back to you.
Respectfully

03-25-2006, 02:43 PM	#1
longhorn70gmc Senior Member Join Date: Feb 2001 Location: Ridgecrest. CA, USA Posts: 1,715	Need help? Hello all, Been a while. I need some help? My engine was rebuilt by the previous owner and my block number is no longer stamped where it should be. I found the Bureau of Automotive repair/engine Identification tag. Is there a way to decode this to discover what the original block number was? OR Is there a place I can go to research it here on the web? I did go to the Bureau's site and it was not helpful. Thanks for the help!! Respectfully __________________ Billy 1970 GMC Sierra Grande 402/TH400 (Longhorn)14 years and counting rebuild! 1975 (Build) Chevrolet SWB 4X4 350 SB Lifted 6 inches 1970 Ford F250 Ranger 390 BB 2010 Ford Super Duty F250 XLT W/4 inch lift kit and Pro Comp Tires Hub Cap Freak! *I need another truck like I need another hole in the head!* I'M IN THE MARKET...AS IT WERE!

03-25-2006, 05:09 PM	#2
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: Need help? Everybody will tell you to look on the block on the left side rear of the engine and you will see a casting number. It will look like this ( 3970010 ) if it is still there . The numbers are about a 1/2 inch long and should be easy to see after you clean the crud off. When you can read them then go to this website,http://www.mortec.com/. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

03-27-2006, 12:01 AM	#3
longhorn70gmc Senior Member Join Date: Feb 2001 Location: Ridgecrest. CA, USA Posts: 1,715	Re: Need help? Thanks for the info. I thought the number was on the front only. I will look and get back to you. Respectfully __________________ Billy 1970 GMC Sierra Grande 402/TH400 (Longhorn)14 years and counting rebuild! 1975 (Build) Chevrolet SWB 4X4 350 SB Lifted 6 inches 1970 Ford F250 Ranger 390 BB 2010 Ford Super Duty F250 XLT W/4 inch lift kit and Pro Comp Tires Hub Cap Freak! *I need another truck like I need another hole in the head!* I'M IN THE MARKET...AS IT WERE!



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