How can I tell what engine I have? On the fan shroud of my 1988 it says 5.0L, but I know the engine was replaced before. I was told it was a 5.7L when I purchased it, but I am not sure of that.

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Check the casting codes on the left rear ledge of the block. They will reveal a little information.

http://72.19.213.157/files/SBCCastNumbers.jpg