How to externally identify a 5.7 LS1???
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Teching In
Joined: Dec 2010
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How to externally identify a 5.7 LS1??? I'm going to be picking up an 5.7 LS1 engine. Question is, how do you differentiate between the LS engine varieties? Don't they all look alike? I don't want to end up with a 4.3 or 5.3... Any markings to look for? I know I could take the seller's word for it, but I have trust issues 
Thanks!
Thanks! 
Back passenger side of the block says displacement. You should also be able to use the casting number just below the drivers side head, on the back of the block. Check head casting numbers too.
12 Second Club
Joined: Feb 2006
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From: Catlettsburg, Ky
The only instance you need to worry about the casting # to identify displacement is when purchasing a cast iron 5.3, they share the same block as a 4.8. Other than that, all the displacement numbers are cast in the block
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