Hello. I bought suburban and got numbers on my block C8g176783. Last digit might be either 3 or 5. Im trying yo identify it and i cant. Help

[Leopol]

I bought suburban 2008, and im trying to identify my block, it aluminum block with 4l65e behind it. Its got 243 headers. got some numbers on my block, C8g176783. Last digit can be 3 or 5. Its not very clear. Help please. Thanks

 

[zora]

Does the 176783 match the last 6 of the VIN?