I'm looking at a block that's been in storage for a long time and need a lot of work. Owner doesn't know much about it other than he claims it to be an LS block. He has given me this information on the casting numbers. None seem to match any casting numbers I can find.


"GM 6.0L

Here are the other numbers on it: X267735. It has a 124 with 4 right under that and 8039213120 on it too. I believe the other number says 83092 but its hard to make out"

 

Is it aluminum or iron? and it will say 4.8, 5.3 5.7 or 6.0 on the back of the block.

 

its 6.0L. But he's not sure if its aluminum or iron.

 

Well for staters he could try picking it up, pretty much a dead give away between a steel and AL block

 

That is true.

 

Yep lol aluminum can be lifted a bit easier since it's about 100lbs less

 

Take the first number to the dealer they can run it.

 

Take the first number to the dealer they can run it. And its usually pretty obvious if its cast or aluminum.

 

Yea wen I went from iron to aluminum there is a huge difference in weight. I put little effort 2 pick up a aluminum block and let's just say we need 2 people for iron

 

Put a magnet to it and you'll know if it's iron or aluminum (can it really be so dirty that he can't tell by looking at it?)

 

Although none of your numbers are in this short list, it'll tell you where to find the casting and/or part numbers on the LS engine block:
http://www.southernperformancesystem...k-casting.html

 

There should be an 8 digit number engraved on one side. It will be on a machined surface, so if the block is dirty you may need some brake cleaner to clean it off. If you can get it, I can look up the VIN and tell you exactly what you have. "X267735" looks like a part of a VIN, but its only 7 digits and I have to have 8 to look it up.