Do you guys know of a web site i can check this casting number out on this block? # 1256733 any help would be much appreciated!! thank you

 

searched for ya, even though you're missing a number. should be 8 digits. 1256 gives a general ls engine but can't find anything with x733 or 733x specifically.
use this site though:
MorTec, Inc. Chevy Smallblock V-8 Casting Numbers List

note: It takes a minute to redirect to mortec though

 

[QUOTE=slow2008;4818255]searched for ya, even though you're missing a number. should be 8 digits. 1256 gives a general ls engine but can't find anything with x733 or 733x specifically.
use this site though:
MorTec, Inc. Chevy Smallblock V-8 Casting Numbers List

note: It takes a minute to redirect to mortec though[/Q

thanks for looking into this. you are right 12567393 is the number on the block. says 4.8/5.3 so i wanted to know exactly what it is.

 

looks like 2006ish. look at the pistons in it. flat top, 4.8. dished, 5.3

 

 

Thats a 5.3L. There is a production date cast into the top area were the water pump coneects to the block. Should look like A105 This is an example The leter indicates the month A= january and so on. the rest would be the day of the month. in this case 10 = 10th of january and the last should be the year 5 = 2005...

 

fast... does G51 sound right? and thanks for your help!

 

or J034?

 

J034 This sound more like it.
J= October
03= 3rd
4= 2004

This would have most likely been installed in an 2005 model vehical.

 

ok i found more info on this block.. they said 2006 suburban so late 05 i bet. they pulled the engine because the oil light was coming on and off so they said oil pump could be bad or spun a rod or main bearing. i took all the main caps off and they look good i will check rods when i get more time. the main thing i wanted to know is if it was a 5.3 and you have ben alot of help. thank you!