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Here's an idea we've tossed around the office: Why not build a 5.7L engine out of a lowly 4.8? It is possible to bore these blocks out to LS1 specs. Considering the asking price for this engine, why wouldn't you? Externally, the iron block says small displacement, so bore that sucker out, plop on some decent heads, slide in a nasty cam, and you've got the makings of a sleeper.